Correct choice is (a) True
The explanation: This Prosite catalog groups proteins that have similar biochemical functions on the basis of amino acid patterns such as those in the active site. Subsequently, these families were searched for amino acid patterns by the MOTIF program (Smith et al. 1990), which finds patterns of the type aa1 d1 aa2 d2 aa3, where aa1 and aa2 are conserved amino acids and d1 and d2 are stretches of intervening sequence up to 24 amino acids long.