Clostridioides difficile metabolism Article Bacteria Bacterial Proteins Bacterial Toxins Clostridioides Enterotoxins Metabolic Networks and Pathways Metabolic modeling Mucins Pseudomonas aeruginosa Transcriptomics Virulence factors bacterial growth bacterial metabolism bacterial protein bacterial toxin bacterial virulence bacterium bacterium identification biofilm carbohydrate carbon carbon source controlled study cytidine enterotoxin gene deletion genetics