One of them (density 1.14 g/mL) contains protein subunits
with molecular masses of 220 and 80 kDa, and the other (density
1.07 g/mL) two protein subunits of 250 and 80 kDa. These
apoproteins are glycosylated and, according to their affinity to
concavalin, mannose is the major sugar component