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Examples of control studies using different isoforms of the GnRH peptide to block labeling with the GF-5 (B-E) and 7CR-10 antisera (G-J) compared to the normal labeling patterns of GF-5 (A) and 7CR-10 (F). Control sections were preabsorbed with either chicken-II (B & G), mammalian (C & H), salmon (D & I), or lamprey GnRH (E & J). Scale bar = 50 μm.
