Lead, Learning, and Calexcitin in Hermissenda

widely different; i.e., a Ki should be determined for Leu-Pro. The third conclusion suggests that a new criterion for the socalled squid type OPAA has emerged, namely, the lack of inhibition by Leu-Pro. Two questions are now to be examined: Do either Leu or Pro, as hydrolysis products, inhibit the Mazur type OPAAs? And if so, do any other amino acids inhibit the squid type OPAA? Because the latter category now includes the enzyme ird, for the first time, a bacteri l OPAA, namely that from seudomonas dim nuta, shows a close resemblance to the squid zyme. The first two conclusions, while appearing valid, from Pseudomonas diminuta as well as from squid nerve, a new approach to the question of a natural substrate for this enzyme may be emerging.