Final answer:
The catalytic triad in serine proteases consists of serine, histidine, and aspartate.
Step-by-step explanation:
The catalytic triad in serine proteases consists of three amino acids: serine, histidine, and aspartate.
The serine residue acts as the nucleophile in the enzyme-catalyzed reaction, while the histidine residue acts as a general base and the aspartate residue stabilizes the positive charge on the histidine residue.