Table 1.

Effects of black widow spider venom on the mESC frequency

External Ca2+ concentration (mm)	n-sybΔ F33B		Line 34
	BWSV (−)	BWSV (+)	BWSV (−)	BWSV (+)
0.2			2.3  ± 0.6 n = 3	58  ± 21 n = 3
0.5	0.7  ± 0.2 n = 4	162  ± 59 n = 3	2.0  ± 0.7 n = 5	553  ± 225 n = 4
2.0	0.8  ± 0.1 n = 6	381  ± 38 n = 3

Numbers are the average number of mESCs per minute ± the SEM and the number of cells examined (n). BWSV (−) indicates measurements in the absence of black widow spider venom, and BWSV (+) shows those in the presence of the venom.