The main WAP isoform usually found in camel milk arises from the usage of an improbable intron cryptic splice site in the precursor to mRNA in which a GC-AG intron occurs

Table 2 Identification of WAP from molecular mass determination using LC-ESI-MS of a clarified Bactrian milk

Peak	Ret.Time, (min)	Observed M_r (Da)	Theoretical M_r (Da)	Protein description	UniProt accession	Intensity
III	24.31	12,564	12,564	WAP variant A, 0P	P09837	896
		12,596	n/a	WAP variant B, 0P	n/a	652
		12,644		WAP variant A, 1P		951
		12,677		WAP variant B, 1P		1059

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