| 1 | But in the morning, the activity of our fibrinolytic system is reduced. | |
| 2 | Keratin is a tough, fibrous protein found in hair and nails. | |
| 3 | The fibrin clot which then forms is consolidated by the action of platelet contractile proteins. | |
| 4 | Silk is a fibrous protein, produced in glands within the spider or silkworm and some insects. | |
| 5 | They also are the source of phospholipid, which is needed for the interaction of coagulation factors to form a fibrin clot. |