Fig. 2From: Comparative genomic and phenomic analysis of Clostridium difficile and Clostridium sordellii, two related pathogens with differing host tissue preferenceNitrogen source utilization microarray. The lists include all positive simple (a) and di- and tri-peptide (b) nitrogen source phenotypes (green) for C. sordellii and C. difficile (lanes 1 and 2, respectively). Negative phenotypes are red (c). The C. sordellii : C. difficile ratio of growth enhancement for each dipeptide nitrogen source phenotype is grouped by amino acid (circles; average – white squares). Gray circles indicate the position 1 amino acid (position 1 average – green squares) while white circles indicate the position 2 amino acid. Amino acids are further grouped (I-V) by their expected pathway to nitrogen metabolism (d)Back to article page