AMINOPEPTIDASE N COMPLEXED WITH THE AMINOPHOSPHINIC INHIBITOR OF PL250, A TRANSITION STATE ANALOGUE HYDROLASE, CLAN MA, FAMILY M1, ZINC PEPTIDASE, INHIBITOR COMPLEX, TRANSITION STATE, AMINOPEPTIDASE, CELL INNER MEMBRANE, CELL MEMBRANE, MEMBRANE, METAL-BINDING, METALLOPROTEASE, PROTEASE, ZINC 2ZXG