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Fig. 2. Pregnancy failure caused by MHC peptides only. Prototypical representative
ligands for H-2b and H-2d haplotypes induce pregnancy
failure when administered without urinary constituents. C57BL/6 female mice
mated with C57BL/6 male mice and exposed to the active form of the MHC peptide
specific for the H-2d haplotype resulted in a significant pregnancy
failure rate. The inactive H-2d peptide failed to block pregnancy.
C57BL/6 female mice mated with BALB/c male mice and exposed to the
H-2b haplotype peptide also showed a significant pregnancy failure
rate. The inactive form of the H-2b peptide failed to block
pregnancy. Alt C57BL/6 and Alt. BALB/c refers to the control peptides, which
had their characteristic anchoring residues changed to alanines, i.e.
AAPDARETA and SAFPEITHA, respectively.