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A, Behavior of native and synthetic peptides on HPLC and MS. B, Chromatograms of MALDI-TOF MS of the native Siberian hamster RFRP-1 and RFRP-3. C, Alignment of amino acid sequences of LPXRFa (X = L or Q) peptides in mammals and birds. C-terminal LPXRFa (X = L or Q) motifs are shown in bold. *, Putative LPXRFa peptides hypothesized from their precursor mRNA sequences.
