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Fig. 3. The spatial and temporal expression patterns of src, fyn, yes, lyn, laloo and csk mRNAs during Xenopus laevis development. (A) Animal (upper row) and lateral (lower row) view of embryonic stages 1, 2, 3 and 8 (blastula) showing enhanced signals in the animal hemisphere. (B) Animal (upper row) and vegetal (lower row) view of gastrula stages (10, 10.5, 11) showing no signal in endodermal cells. (C) Anterior and dorsal view of mid-neurula (stage 16) embryo. SFKs and csk are expressed at the neural folds from anterior to caudal end, but absent from the dorsal midline. (D,E) Lateral view of tailbud (stage 28, 31) embryos. Expression of SFKs and csk persists in the developing brain, neural tube, eye, branchial arches and otic vesicle. Bottom panels depict the expression pattern of myoD used as a positive control. First two panels show lateral and dorsal view of stage 23 embryos and the other two panels show lateral view of stage 31 embryos with the expression pattern of myoD.