…sperm AR stimulated by progesterone, (Luconi et al., 1995; Meizel and Turner, 1996; Kirkman-Brown et al., 2002) and LPC- and A23187-induced AR are associated with higher levels of Tyr phosphorylation of p80 and p105 (Aitken et al., 1995; de Lamirande et al., 1998; de Lamirande and Gagnon, 2002).