two-types anchor in "... To Make Predictions"

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@@ -71,7 +71,7 @@ Of course, the phrasing _If gender dysphoria is caused by ..._ implies that we'r
 
 Analogously, in medicine, many different pathogens can cause the same symptoms (_e.g._, sneezing, or fever), but doctors care about distinguishing different illnesses by etiology, not just symptoms, because distinct physical mechanisms can give rise to distinct treatment decisions, if not immediately, then at least in principle. For example, a bacterial illness will respond to antibiotics, but a viral one won't—or today's treatments might be equally effective against two different species of bacteria, but future drugs might work better on one or the other.
 
 
 Analogously, in medicine, many different pathogens can cause the same symptoms (_e.g._, sneezing, or fever), but doctors care about distinguishing different illnesses by etiology, not just symptoms, because distinct physical mechanisms can give rise to distinct treatment decisions, if not immediately, then at least in principle. For example, a bacterial illness will respond to antibiotics, but a viral one won't—or today's treatments might be equally effective against two different species of bacteria, but future drugs might work better on one or the other.
 

-_As it happens_, (I claim that) the evidence that gender dysphoria comprises more than one etiologically distinct condition is quite strong. For the rest of this post, I'm going to focus on the male-to-female case for reasons of personal interest,[ref]See many other [posts](/2017/Feb/a-beacon-through-the-darkness-or-getting-it-right-the-first-time/) [on](/2017/Jan/the-erotic-target-location-gift/) [this](/2017/Dec/a-common-misunderstanding-or-the-spirit-of-the-staircase-24-january-2009/) [blog](/2016/Nov/chromatic-key/).[/ref] quality of available research,[ref]The etiology of trans men is less well-researched than that of trans women: while there is a gynephilic group whose blurry etiological boundary with butch lesbians looks like a fairly straightforward analogue of the relationship between androphilic trans women and feminine gay men, it's less clear whether autoandrophilia ("love of oneself as a man") might play a similar role for non-gynephilic trans men as autogynephilia does in the male-to-female case—and the [distribution of trans men may be changing in recent years](http://www.slate.com/blogs/outward/2017/09/13/trans_youth_clinics_are_seeing_more_trans_boys_than_before_why.html).[/ref] and because no one cares about trans men.[ref]Less glibly: discussions of the social implications of transgenderedness tend to focus on trans women, likely because trans men tend to pass better, and because insofar as the intended purpose of many sex-segregated social contexts is to protect females from males, biologically-female trans men aren't perceived as a threat: cis men are assumed to be able to take care of their own interests.[/ref] An analysis of the female-to-male situation would be similar in many respects but different in others, and is left to the interested reader.
+<a id="two-types"></a>_As it happens_, (I claim that) the evidence that gender dysphoria comprises more than one etiologically distinct condition is quite strong. For the rest of this post, I'm going to focus on the male-to-female case for reasons of personal interest,[ref]See many other [posts](/2017/Feb/a-beacon-through-the-darkness-or-getting-it-right-the-first-time/) [on](/2017/Jan/the-erotic-target-location-gift/) [this](/2017/Dec/a-common-misunderstanding-or-the-spirit-of-the-staircase-24-january-2009/) [blog](/2016/Nov/chromatic-key/).[/ref] quality of available research,[ref]The etiology of trans men is less well-researched than that of trans women: while there is a gynephilic group whose blurry etiological boundary with butch lesbians looks like a fairly straightforward analogue of the relationship between androphilic trans women and feminine gay men, it's less clear whether autoandrophilia ("love of oneself as a man") might play a similar role for non-gynephilic trans men as autogynephilia does in the male-to-female case—and the [distribution of trans men may be changing in recent years](http://www.slate.com/blogs/outward/2017/09/13/trans_youth_clinics_are_seeing_more_trans_boys_than_before_why.html).[/ref] and because no one cares about trans men.[ref]Less glibly: discussions of the social implications of transgenderedness tend to focus on trans women, likely because trans men tend to pass better, and because insofar as the intended purpose of many sex-segregated social contexts is to protect females from males, biologically-female trans men aren't perceived as a threat: cis men are assumed to be able to take care of their own interests.[/ref] An analysis of the female-to-male situation would be similar in many respects but different in others, and is left to the interested reader.

 
 A minority of male-to-female transsexuals exhibit lifelong sex-atypical behavior and interests, are attracted to men[ref]_N.b._, the typical female sexual orientation[/ref], and transition early in life (typically no later than their early twenties). Essentially, these are physiological males whose psychology is so far outside of the male normal range along so many dimensions that they find themselves more comfortable and socially successful living as women rather than as extremely effeminate gay men. This likely _is_ a brain-intersex condition: [along with non-gender-dysphoric gay men](https://en.wikipedia.org/wiki/Fraternal_birth_order_and_male_sexual_orientation), they [have a statistical preponderance of older brothers](https://link.springer.com/article/10.1007%2Fs10508-011-9777-6) which is [theorized to be due to the mother's immune system response to male fetuses affecting the development of later pregnancies](http://www.pnas.org/content/115/2/302).
 
 
 A minority of male-to-female transsexuals exhibit lifelong sex-atypical behavior and interests, are attracted to men[ref]_N.b._, the typical female sexual orientation[/ref], and transition early in life (typically no later than their early twenties). Essentially, these are physiological males whose psychology is so far outside of the male normal range along so many dimensions that they find themselves more comfortable and socially successful living as women rather than as extremely effeminate gay men. This likely _is_ a brain-intersex condition: [along with non-gender-dysphoric gay men](https://en.wikipedia.org/wiki/Fraternal_birth_order_and_male_sexual_orientation), they [have a statistical preponderance of older brothers](https://link.springer.com/article/10.1007%2Fs10508-011-9777-6) which is [theorized to be due to the mother's immune system response to male fetuses affecting the development of later pregnancies](http://www.pnas.org/content/115/2/302).