Animals 2 BRCA1 protein 2 Cebidae 2 Cebus 2 Cebus paraguayanus 2 Cell Cycle Proteins 2 Chromosome Pairing 2 Chromosomes 2 Heterochromatin 2 In Situ Hybridization, Fluorescence 2 Male 2 Meiosis 2 Platyrrhini 2 Primates 2 Recombination, Genetic 2 Spermatocytes 2 Synapsis 2 animal 2 animal cell 2 article 2 autosome 2 cell cycle protein 2 cell nucleus 2 chromosome 2 chromosome bivalent 2 chromosome pairing 2 chromosome protein 2 fluorescence in situ hybridization 2 genetic recombination 2 genetics 2