Medically reviewed by Dr. Shani S. Saks, D.O. on August 23, 2023 The genetic coding variant rs4151651, in complement factor B, altered complement factor cleavage, alternative pathway activation, and phagocytosis of the pathogen in subjects with perianal Crohn’s disease. Perianal Crohn’s disease (pCD) is a prevalent condition in CD patients that is related to uncertain...