with me right now to tell us about participation in the study are 15-year-old twins rachel and mya siskin-lavigne alexandra anderson. i want to start with the twins. i know everybody calls you that, right? >> yes. >> so mya on the end, when did you go through puberty? when did you start? >> i can't remember exactly when. it was pretty early, in the end of elementary school. >> same thing for you, race sne rachel? >> i started a little bit before her but about the same time. >> the same time we started the cignet study, a little later. >> when did your mom enroll you in it? >> my mom told me they were doing this study looking at girls and puberty. i thought okay why not. we kind of just looked at each other and said sure. >> rachel, what was it like for you guys to go through puberty? was it hard? >> it's always a little scary i guess because new things are happening and you're changing and you don't really know what's going on because you've never done it before. but i mean, my mom was really nice about it. and being in the cignet study helped because we got to learn about what was happening to u

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