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“The addition of glycylglycine to both mucosal and serosal media modified the permeation of ceftibuten and cephalexin from the absorptive to the secretory direction.”
British journal of clinical pharmacology • 2002 | View Paper
“It was found that dipeptides such as L-carnosine and glycylglycine significantly reduced the binding of cephalexin to fraction b, but the binding of cephradine was only slightly decreased by these dipeptides.”