Table II. Percentage of dead embryos which have the following defects.

Genotype	U-shapeda	Tail-upb	Dorsal defectsc	Wild-type	Dorsal and head defectsd	n
	%	%	%	%	%
abl 4 glc x +/+	Not applicable as almost all hatch
abl 4 glc x shg 2/+	7	2	45	6	40	298
abl 4 glc x shg R69/+	10	2	54	2	32	121
abl 4 glc x abl 4/+	7	14	67	6	6	388
abl 4 glc x shg 2/+; abl 4/+	2	5	13	10	70	141
abl 4 glc x shg R69/+; abl 4/+	3	1	60	4	38	307
abl 1 glc x abl 1/+	1	13	67	17	1	91
abl 1 glc x scb 2/+; abl 1/+	3	8	75	10	5	63

^aEmbryos in this class exhibited a complete failure in germband retraction.

^bEmbryos in this class exhibited strong defects in germband retraction and also often had defects in dorsal closure.

^cEmbryos in this class exhibited defects in dorsal closure ranging from dorsal holes to defects in the dorsal pattern.

^dEmbryos in this class exhibited severe defect in head involution; most also showed defects in dorsal closure and/or germband retraction.