Collagen , in the form of elongated fibrils , is mostly found in fibrous tissues such as tendons , ligaments and skin , and is also abundant in corneas , cartilage , bones , blood vessels , the gut , and intervertebral discs .
Collagen , in the form of elongated fibrils , is mostly found in fibrous tissues such as tendon , ligament and skin , and is also abundant in cornea , cartilage , bone , blood vessels , the gut , and intervertebral discs .