Antibody:	anti-ATF6
Detection system:	Biotinylated secondary antibody/[Strept]avidin coupled to horseradish peroxidase

Structure	Level	Pattern	Image	Note
TS20: bone	Absent		1Aa

Structure	Level	Pattern	Image	Note
TS22: cartilage condensation	Present	Regionally restricted	1Ab	Expression in center and surrounding condensation of cartilage.

Structure	Level	Pattern	Image	Note
TS23: cartilage condensation	Present	Regionally restricted	1Ac	Expression high in prehypertrophic chondrocytes.

Structure	Level	Pattern	Image	Note
TS25: long bone epiphysis	Present	Regionally restricted	1Ad	Expression high in prehypertrophic chondrocytes.

Structure	Level	Pattern	Image	Note
TS27: epiphyseal plate hypertrophic zone	Present	Widespread	1Ae	Expression over entire growth plate. Authors report nuclear expression in both proliferating and hypertrophic zones during entire process of chondrogenic development.
TS27: epiphyseal plate proliferative zone	Present	Widespread	1Ae	Expression over entire growth plate. Authors report nuclear expression in both proliferating and hypertrophic zones during entire process of chondrogenic development.

Structure	Level	Pattern	Image	Note
TS28: epiphyseal plate hypertrophic zone	Present	Widespread	1Af	Expression over entire growth plate. Authors report nuclear expression in both proliferating and hypertrophic zones during entire process of chondrogenic development.
TS28: epiphyseal plate proliferative zone	Present	Widespread	1Af	Expression over entire growth plate. Authors report nuclear expression in both proliferating and hypertrophic zones during entire process of chondrogenic development.