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Presence of the carrier, indicated by m/z 1331.52 [M + Na]+, was detected in the intestinal lumen in the carrier, 6-d UP + carrier, sterol + carrier, and 6-d UP + sterol + carrier groups, but not in the control and 6-d UP groups: m/z 760.59 [M + H+ was a homogenously distributed PC lipid present in the intestinal epithelial layer. Scale bar indicates 5 mm. Abbreviations: PCs, phosphocholines; UP, U. parvum.
