Table 2. cAMP content in sperm during capacitation

Control (pmol)	OPN	anti-OPN antibody
5.144 ± 0.180	5.962 ± 0.196	4.163 ± 0.164

cAMP content in sperm treated with OPN protein for 4 h.
cAMP, cyclic adenosine monophosphate; OPN, osteopontin.