RT Journal Article SR Electronic T1 Intestinal IgA: novel views on its function in the defence of the largest mucosal surface JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 2 OP 5 DO 10.1136/gut.44.1.2 VO 44 IS 1 A1 J MESTECKY A1 M W RUSSELL A1 C O ELSON YR 1999 UL http://gut.bmj.com/content/44/1/2.abstract AB