1. Shamsher, M K, Chuzhanova, N A, Friedman, B, Cooper, D N, Berg, L P. . Identification of an intronic regulatory element in the human protein C (PROC) gene. In Human genetics, 107, 458-65. doi:. https://pubmed.ncbi.nlm.nih.gov/11140943/
2. Hoshino, T, Kosuge, T, Hidaka, Y, Tabata, K, Nakahara, T. . Molecular cloning and sequence analysis of the proC gene encoding delta 1-pyrroline-5-carboxylate reductase from an extremely thermophilic eubacterium Thermus thermophilus. In Biochemical and biophysical research communications, 199, 410-7. doi:. https://pubmed.ncbi.nlm.nih.gov/8123043/
3. Perry, Brent R, Assis, Raquel. 2016. CDROM: Classification of Duplicate gene RetentiOn Mechanisms. In BMC evolutionary biology, 16, 82. doi:10.1186/s12862-016-0644-x. https://pubmed.ncbi.nlm.nih.gov/27080514/