Carbohydrate Expression in the Intestinal Mucosa Jr. Thomas provides advice on overcoming the 53 provides advice on overcoming the common problems and pitfalls sometimes encoun tered by users of the sequence analysis software The model takes into account both the role played by creativity in the production of culture in a technologically advanced knowledge society 93 VII Abbreviations AB Alcian blue AB PAS Alcian blue periodic acid Schiff ABC avidin biotin complex amine precursor uptake and decarboxylation APUD CCK cholecystokinin Cv conventional CV P conventional animal fed purified diet conventional animal fed commercial diet CV C DAB diaminobenzidine EC enteroglucagon follicle associated epithelium FAE FITC fluorescein isothiocyanate GALT gut associated lymphoid tissue GF germ free GF P germ free animal fed purified diet GF C germ free animal fed commercial diet GLI grey level index haematoxylin and eosin H&E HFA human flora associated HFA P human flora associated fed purified diet IBAS interaktives Bild Analyse System PAS periodic acid Schiff PYY peptide with tyrosine (Y) at the N terminus and tyrosine (Y) amide at the C terminus scm severe combined immunodeficiency SCFA short chain fatty acid SIR serotonin immunoreactive Abbreviations for lectins and their specific sugars are shown in Tables 2 This epithelium represents a vast surface area that is vulnerable to foreign antigens and microbial pathogens