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BSA beads (c,d) do not affect normal expression of these genes. dml: dorso-medial lip, dmm: dorsal muscle mass, vmm, ventral muscle mass, nt: neural tube, nc, notochord, m: myotome, AER: apical ectodermal ridge. Red arrows show regions of increased mRNA expression in grafted limbs, black arrows the regions of endogenous gene expression in the contralateral limbs.
