part_of part of part of developmental process involved in reproduction spermatid development cellular process involved in reproduction in multicellular organism sperm capacitation biological_process GO:0048240 A process required for sperm to reach fertilization competence. Sperm undergo an incompletely understood series of morphological and molecular maturational processes, termed capacitation, involving, among other processes, protein tyrosine phosphorylation and increased intracellular calcium. cell maturation