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Fig. S4 Pectoral tendon populations are specified and maintained in the absence of cartilage. (A-B, D-E) sox9a morphants have loss of col2a1-positive pharyngeal cartilage and altered pattern of scxa expression at 53-57 hpf. (C, F) sox9a-sox9b deficient embryos have lost col2a1-positive pharyngeal cartilage, yet retain scxa expression at 53-57 hpf. (G-I) Embryos deficient in sox9a and/or sox9b transcripts express scxa at 72 hpf. (J-L) Embryos deficient in sox9a and/or sox9b transcripts express tnmd at 96 hpf. Representative lateral (left) and dorsal (right) views of pectoral fin tissue are indicated for each category of embryos.