FN1 and colorectal carcinoma: It is notable that studies seeking to delineate the contributions of Fn in CRC predominately use the model strains Fnn ATCC 25586 (ref. 7), an oral isolate, Fnn ATCC 23726 (refs. 20,31), a urogenital isolate, and Fna 7_1 (ref. 29), an isolate from a patient with IBD.