GnRH molecular variants in the brain and pituitary gland of pejerrey, Odontesthes bonariensis (Atheriniformes). Immunological and chromatographic evidence for the presence of a novel molecular variant

atheriniformes biochemical polymorphism brain cerebro fishes gnrh gonadotropin releasing hormone hormona liberadora de gonadotropina hypophyse mugiloidei neuropeptides odontesthes bonariensis peces peptide peptides pituitary gland poisson (animal) polymorphisme biochimique radioimmunoassay technique radioimmunologique