Table 1.

Effects of wild-type and defective Jak1 kinases on zebrafish development

Jak1 kinase	Epiboly defect*			Anterior defect†
	No.	n	%	No.	n	%
JakWt	9	234	4	0	35	0
JakKE	90	116	76	23	32	72
JakΔkin	150	205	73	37	53	70
JakWt + JakΔkin	40	148	27	10	36	28

^*Embryos that did not complete epiboly by 12 h. 

^†Embryos allowed to develop for 24 h that possess reduced eye and head structures.