Characterization and Functional Assessment of Clostridium Histolyticum Class I (C1) Collagenases and the Synergistic Degradation of Native Collagen in Enzyme Mixtures Containing Class II (C2) Collagenase by Jessica Helweg | Jan 8, 2019 A.G. Breite, R.C. McCarthy, F.E. Dwulet. (2011). Characterization and Functional Assessment of Clostridium Histolyticum Class I (C1) Collagenases and the Synergistic Degradation of Native Collagen in Enzyme Mixtures Containing Class II (C2) Collagenase. Transplantation Proceedings. 43. 3171-5. https://doi.org/10.1016/j.transproceed.2011.09.059.