the 60 500-mr polypeptide appeared to be a common precursor to all four individual lectin subunits since ( a ) its glycosylated ( 66 000-68 000-mr ) forms were readily detected in the endoplasmic reticulum fraction isolated from maturing castor bean endosperm and ( b ) pulse-chase studies showed that the glycosylated precursors disappeared from the endoplasmic reticulum fraction with the concomittant appearance of authentic lectin subunits in a soluble protein fraction which included protein body matrix components .
C0023206
lectin
C0033684
protein