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Mon. Marsu. mammary gland. Synapsids. alpha keratins. pilosebaceous unit. Mammals (Eutherians). Mammaliaforms. Basal Amniotes. Lizards, Snakes. Lepidosaurs. reticula. alpha keratins. beta keratins alpha keratins. Sauropsids. Dinosaurs. Birds. Archosaurs.
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Mon. Marsu. mammary gland Synapsids alpha keratins pilosebaceous unit Mammals (Eutherians) Mammaliaforms Basal Amniotes Lizards, Snakes Lepidosaurs reticula alpha keratins beta keratins alpha keratins Sauropsids Dinosaurs Birds Archosaurs alpha keratins -- beta keratins feather Theropods scuta Crocodiles Figure 7 Iconographer : Brigitte Peyrusse