By means of column and paper chromatography 16 aspartyl diand tripeptides and 3 glutamyl dipeptides have been isolated from pooled collections of human urine. All but one of the aspartyl peptides have the ß linkage and the glutamyl peptides have the 7 linkage. /3-L-Aspartylglycine is the most abundant of these, and by isotopic means it was shown that it does not arise by isomerization of -aspartylglycine during the isolation. The more abundant of these peptides, /3-aspartylglycine and /3-aspartylserine, were also found in 24-hour urine collections from fasted patients.

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