Uneven distribution of E-cadherin in the crypt epithelium. Sections of whole mount immuocytochemical examination of dissected adult jaw. The rostral crypts in the pharyngeal region of adult zebrafish express E-cadherin throughout the epithelium (A). This contrasts to the more caudal crypt epithelium, which loses E-cadherin expression, except along the crypt bases (B). Cells placed rostrally at the base of the crypt always have stronger E-cadherin expression (C, C') than cells placed more caudally within the same crypt (D, D'). c: crypt; ph.c.: pharyngeal cavity. Scale bars = 50 um, scale bar C', D' = 10 μm.