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Fig. 6 Expression of opioid receptors during the tail bud stage.
Opioid receptors: zfmor (A, C and E), zfdor1 (G, I and K) and zfdor2 (M, O and Q) were expressed during the tail bud stage (approximately 10 hpf). In all panels, the anterior aspect is to the left. For each opioid receptor, the left and right sides represent the embryos untreated and treated with cocaine respectively. A and B, lateral views (applies to G and H, M and N). C-F, animal pole views (applies to I-L, O-R). Arrowhead points to the future region of the tail bud, arrow indicates CNS development. Asterisks show the polster. Scale bar: 250 μm in A (applies to B-R).