A simplified procedure for the fractionation and purification of different collagen types from various tissues is described which is particularly efficient in separating type-V from type-IV collagen, and highmol.-wt. (HMW) aggregates from 7 S collagen. Uterus and maternal villi contain 2 forms of type-V collagen −{α1(V)}2α2(V) and {α1(V)2α2(V)α3(V)}–which have been separated on DEAE-cellulose. Uterus however appears to be the richest source of both HMW aggregates and the {α1(V)2α2(V)α3(V)} collagen, and a probable relationship between these collagens is discussed.

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