Cysteine proteinase inhibitors in human placenta.


When human placental extract was chromatographed on a Sephadex G-75 column, cysteine proteinase inhibitors with molecular weights of 80 000 and 12 300 were eluted. The high molecular weight peak (CPI-H) was identified as alpha-cysteine proteinase inhibitor. The thermostable low molecular weight peak (CPI-L) inhibited plant proteinases (papain, ficin and… (More)


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