The indirect immunofluorescence method was used to study the human term placenta in pathological pregnancy for the distribution of collagen types I, III, IV, V, and fibronectin in fibrosis stromatis villi. All collagen types and fibronectin were shown to participate in fibrosis villorum formation. Fibronectin was also detected in the fibrinoid that surrounded villi at stroma. The presence of free cytotrophoblast cells in the fibrinoid was accompanied by a noticeable increase in fibronectin fluorescence. A significant amount of collagen types IV and V and a less amount of collagen types I and III were identified.
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