Table 1.

Increase (Δ) in [Na⁺]_i, [Ca²⁺]_i and pH_i induced by fucose-sulphate glycoconjugate (FSG) in the presence and absence of the sperm-activating peptide, speract

Ion	ΔFSG	ΔSperact + FSG
[Na+]i	31 ± 9	30 ± 6
(mm)	(n = 3)	(n = 9)
[Ca2+]i	1700 ± 157	1857 ± 220
(nm)	(n = 10)	(n = 9)
pHi	0.45 ± 0.06	0.42 ± 0.10
(pH units)	(n = 10)	(n = 9)

Sperm were loaded with Na⁺-binding benzofuran isophthalate (SBFI AM), fura-2 AM and 2′7′-bis-(2-carboxyethyl)-5-(and-6)-carboxyfluorescein, acetoxymethylester (BCECF AM), as indicated in Methods. the values are the mean ± s.e.m. of the maximum increase (Δ) of at least three experiments.