Probe:	Prx1 probe5
Probe preparation:	Antisense RNA

Structure	Level	Pattern	Image	Note
TS17: 3rd branchial arch	Present	Regionally restricted	10A , 10B	Prx1 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 fashion to Pax3.
TS17: 4th branchial arch	Present	Regionally restricted	10A , 10B	Prx1 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 fashion to Pax3.
TS17: 6th branchial arch	Present	Regionally restricted	10A , 10B	Prx1 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 fashion to Pax3.
TS17: outflow tract	Present	Regionally restricted	10A , 10B	Prx1 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 fashion to Pax3.
TS17: 1st branchial arch	Present		10A , 10B
TS17: 1st branchial arch maxillary component	Present		10A , 10B
TS17: 2nd branchial arch	Present		10A , 10B
TS17: limb	Present		10B , 10A	Prx1 was present in the limb bud.
TS17: neural tube	Absent		10B , 10A
TS17: trunk somite	Absent		10A , 10B	Somite derivatives were negative.

Structure	Level	Pattern	Image	Note
TS17: 3rd branchial arch	Weak	Regionally restricted	10C , 10D	The stream of cells expressing Prx1 was considerably reduced in mutant embryos.
TS17: 4th branchial arch	Weak	Regionally restricted	10C , 10D	The stream of cells expressing Prx1 was considerably reduced in mutant embryos.
TS17: 6th branchial arch	Weak	Regionally restricted	10C , 10D	The stream of cells expressing Prx1 was considerably reduced in mutant embryos.
TS17: outflow tract	Weak	Regionally restricted	10C , 10D	The stream of cells expressing Prx1 was considerably reduced in mutant embryos.
TS17: 1st branchial arch	Present		10D , 10C	Expression in this mutant is the same as in wild-type embryos.
TS17: 1st branchial arch maxillary component	Present		10D , 10C	Expression in this mutant is the same as in wild-type embryos.
TS17: 2nd branchial arch	Present		10D , 10C	Expression in this mutant is the same as in wild-type embryos.
TS17: limb	Present		10D , 10C	Expression in this mutant is the same as in wild-type embryos.
TS17: neural tube	Absent		10D , 10C	Expression in this mutant is the same as in wild-type embryos.
TS17: trunk somite	Absent		10D , 10C	Expression in this mutant is the same as in wild-type embryos.