Sequence of 2 discriminating polypeptides indicative for GVHD. Two prominently excreted polypeptides for GVHD (Table 3) were sequenced yielding peptides shown above as MALDI-MS-MS spectra as well as sequence. Searching of the databases revealed one 1.85 kDa/34 minutes polypeptide from leukotriene A4 hydrolase (A) and one 1.83 kDa/33.2 minutes polypeptide from serum albumin (B).