Probe:	Mo-10 probe2
Probe preparation:	Antisense RNA

Structure	Level	Pattern	Image	Note
TS17: 3rd branchial arch	Present	Regionally restricted	9A	Hoxa3 was expressed in a stream of cells that appeared to transverse the third, fourth and developing sixth branchial arches, entering the aortic sac and outflow tract in a similar fasion to Pax3.
TS17: 4th branchial arch	Present	Regionally restricted	9A	Hoxa3 was expressed in a stream of cells that appeared to transverse the third, fourth and developing sixth branchial arches, entering the aortic sac and outflow tract in a similar fasion to Pax3.
TS17: 6th branchial arch	Present	Regionally restricted	9A	Hoxa3 was expressed in a stream of cells that appeared to transverse the third, fourth and developing sixth branchial arches, entering the aortic sac and outflow tract in a similar fasion to Pax3.
TS17: outflow tract	Present	Regionally restricted	9A	Hoxa3 was expressed in a stream of cells that appeared to transverse the third, fourth and developing sixth branchial arches, entering the aortic sac and outflow tract in a similar fasion to Pax3.
TS17: neural tube	Present	Regionally restricted	9A	The anterior limit of Hoxa3 expression in the neural tube was at the boundary between rhombomeres 4 and 5.
TS17: 1st branchial arch	Present		9A
TS17: 2nd branchial arch	Present		9A
TS17: limb	Present		9A	Expression was seen in the limb bud.

Structure	Level	Pattern	Image	Note
TS17: 3rd branchial arch	Weak	Regionally restricted	9B	The stream of cells expressing Hoxa3 was considerably reduced in mutant embryos.
TS17: 4th branchial arch	Weak	Regionally restricted	9B	The stream of cells expressing Hoxa3 was considerably reduced in mutant embryos.
TS17: 6th branchial arch	Weak	Regionally restricted	9B	The stream of cells expressing Hoxa3 was considerably reduced in mutant embryos.
TS17: outflow tract	Weak	Regionally restricted	9B	The stream of cells expressing Hoxa3 was considerably reduced in mutant embryos.
TS17: neural tube	Present	Regionally restricted	9B	Expression in this mutant is the same as in wild-type embryos, although the intensity of expression in the occipital and cervical regions was reduced.
TS17: 1st branchial arch	Present		9B	Expression in this mutant is the same as in wild-type embryos, although the intensity of expression in the branchial arches was reduced.
TS17: 2nd branchial arch	Present		9B	Expression in this mutant is the same as in wild-type embryos, although the intensity of expression in the branchial arches was reduced.
TS17: limb	Present		9B	Expression in this mutant is the same as in wild-type embryos.