Fig. 1From: Investigation of MMP-1 genetic polymorphisms and protein expression and their effects on the risk of Kashin-Beck disease in the northwest Chinese Han populationExpression of MMP-1 in different layers of cartilage (immunohistochemistry using the SP method; original magnification ×100). a The cartilage of a KBD. b The cartilage of a healthy control. c A negative control with PBS was used instead of the anti-MMP-1 primary antibodyBack to article page