COL3A1 and myocardial infarction: Another study in mice demonstrated that gene expression of fibroblasts was skewed toward Ki-67, COL1A2, collagen type III alpha 1 chain (COL3A1), collagen type V alpha 1 chain (COL5A1), SPARC, secreted frizzled related protein 2 (SFRP2), and DKK3 following myocardial infarction (49).