Sharks and rays have the oldest vertebrate sex chromosome with unique sex determination mechanisms - Taiki Niwa; Yoshinobu Uno; Yuta Ohishi; Mitsutaka Kadota; Naotaka Aburatani; Itsuki Kiyatake; Daiki Katooka; Michikazu Yorozu; Nobutaka Tsuzuki; Atsushi Toyoda; Wataru Takagi; Masaru Nakamura; et al. (Proceedings of the National Academy of Sciences, 2025)