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Summary of the basement membrane (BM) components and cellular integrin differential expressions along human small intestinal/colon tissues. COLL: collagen.
| Proteins | Bottom Crypt | Upper Crypt | Villus | |
|---|---|---|---|---|
| BM | COLL4A1, COLL4A2 | + | + | + |
| COLL4A5 | + | + | + | |
| COLL4A3, COLL4A4 | − | − | − | |
| Perlecan | + | + | + | |
| Laminin α1β1γ1 | − | − | + | |
| Laminin α2β1γ1 | ++ | + | − | |
| Fibronectin | ++ | + | − | |
| Tenascin-C | − | + | ++ | |
| Integrin | β1 | + | + | + |
| β4 | + | + | + | |
| α1 | − | + | − | |
| α2 | + | + | − | |
| α3 | − | + | + | |
| α4 | − | − | − | |
| α5 | − | − | − | |
| α6 | + | + | + | |
| α7 | − | + | − |
