Extended Data Fig. 2: Growth series of Alligator mississippiensis embryonic pelvis, hindlimb and tail stained for skeletal muscles, cartilage and nervous tissues.
From: The developing bird pelvis passes through ancestral dinosaurian conditions
A. Cartilage (collagen II, blue) and skeletal muscle (MF-20, red). Approximate embryonic stages, top to bottom: F13 (15 days), F16 (21 days), F17 (22–23 days), F19 (27–28 days). B. Skeletal muscle (MF-20, red) and nervous tissue (NF-M, blue). Approximate embryonic stages, top to bottom: F13 (15 days), F15 (18–20 days), F16 (21 days), F17 (22–23 days). [2 columns].
