J F Rehfeld et al.
The Journal of clinical endocrinology and metabolism, 86(1), 251-258 (2001-03-07)
Cholecystokinin (CCK) occurs in multiple molecular forms; the major ones are CCK-58, -33, -22, and -8. Their relative abundance in human plasma and intestine, however, is debated. To settle the issue, extracts of intestinal biopsies and plasma from 10 human