RT Journal Article SR Electronic T1 Molecular radii of probes used in studies of intestinal permeability. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 110 OP 111 DO 10.1136/gut.28.1.110 VO 28 IS 1 A1 R T Jenkins A1 R A Bell YR 1987 UL http://gut.bmj.com/content/28/1/110.abstract AB