Table 1.

Frequency of transgenic myotomal expression by MRF4 promoters

Promoter		Experiment no.	GFP+ embryos
XMRF4a promoters
	9.5 kb	1	24% (11/46)
		2	22% (15/69)
		total	23% (26/115)
	3.6 kb	1	27% (25/94)
		2	15% (8/53)
		3	59% (10/17)
		total	26% (43/164)
	1.1 kb	1	36% 87/239
		2	8% (10/126)
		3	55% (40/73)
		total	31% (137/438)
	610 bp	1	67% (8/12)
		2	7% (3/44)
		3	57% (12/21)
		total	30% (23/77)
	360 bp	1	20% (26/129)
		2	25% (1/4)
		total	20% (27/133)
	180 bp (wt)	1	8% (13/158)
		2	6% (9/147)
		3	20% (5/25)
		total	8% (27/330)
	180 bp (D+M−)	1	0% (0/120)
		2	0% (1*/228)
		total	0% (1*/348)
			*faint, questionable staining
rat MRF4 promoter
	410 bp	1	7% (6/87)
		2	12% (15/123)
		total	10% (21/210)