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(Photo by Vitali Adutskevich via Pexels)

(Photo by Arina Krasnikova via Pexels)

Professor Hiroyuki Sasaki, a geneticist at Kyushu University with a soft spot for cats, makes fast friends with one of the calico cats at a lo…

Calico cats (left) and tortoiseshell cats (right) are the classic example of X chromosome inactivation, where either an orange color or a blac…