MALDI-TOF mass spectrometry was successfully utilized to monitor the amide hydrogen/deuterium exchange in protein kinase Pak2 activation.
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.