The interrenal gland in zebrafish is the teleostean counterpart of the mammalian adrenal gland. This protocol introduces how to perform the 3-β-hydroxysteroid dehydrogenase (Δ5-4 isomerase; 3β-Hsd) enzymatic activity assay, which detects differentiated steroidogenic cells in the developing zebrafish.
Chou, C., Lin, J., Hou, H., Liu, Y. Visualizing the Interrenal Steroidogenic Tissue and Its Vascular Microenvironment in Zebrafish. J. Vis. Exp. (118), e54820, doi:10.3791/54820 (2016).