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Four pepsinogens (PG-I, PG-II, PG-III, and PG-IV) were identified in sea bream (Sparus latus Houttuyn) stomach and were purified to homogeneity by 20–60% ammonium sulfate fractionation and several chromatographies. The molecular weights of the four purified PGs were 36, 32, 32, and 34kDa, respectively. All the pepsinogens converted into pepsins within a few minutes under pH 2.0. The molecular weights...
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