benzylsulfonyl fluoride 8 nonhuman 6 Hydrogen-Ion Concentration 4 Kinetics 4 Porphobilinogen 4 Saccharomyces cerevisiae 4 article 4 chemistry 4 isolation and purification 4 molecular weight 4 pH 4 porphobilinogen deaminase 4 1,10 phenanthroline 2 4 dimethylaminobenzaldehyde 2 Amino Acid Sequence 2 Animal 2 Article 2 Aspartic Acid Proteases 2 Bufo arenarum 2 Caseinolytic activity 2 Chromatography, Gel 2 Female 2 Fruit 2 Hydroxymethylbilane Synthase 2 Insulin 2 Molecular Sequence Data 2 Molecular Weight 2 Peptide mass fingerprinting 2 Phenylmethylsulfonyl Fluoride 2 Plant aspartic protease 2