Table 2.

Hatching rate of twi::Gal4 > Opto-htl embryos illuminated from specified stages until end of embryogenesis.

Illumination onwards stage x till hatching (stage x =)	Illumination time from cellularization stage	Stage Hallmark	No. of embryos screened	No. of embryos hatched	% hatchability
5	0 min	Cellularisation	31	2	6.4
6/7	40 min	Gastrulation	7	0	0
8/9	1–2:10 h	Germ band Elongation starts	5	0	0
10	2:10 h	Germ band Elongation finishes	40	1	2.5
12	5:10 h	Germ Band retraction starts	34	0	0
13	7:10 h	Midgut primordium forms a sack	19	17	89
14	8:10 h	Head Involution and DC starts	11	11	100
15	9:10 h	Dorsal Closure	18	18	100
16	11 h	Gut constrictions appear	12	11	91.6
17	14 h	First movements start; Trachea filling	16	16	100