Antibody:	anti-cyclin D1
Detection system:	Biotinylated secondary antibody/[Strept]avidin coupled to horseradish peroxidase

Structure	Cell Type	Level	Pattern	Image	Note
TS27: organ of Corti	cochlea auditory hair cell	Absent		4b	No expression in hair cells of organ of Corti.
TS27: cochlea	Deiter's cell	Absent		4b	No expression in Deiter's cells.
TS27: cochlea	supporting cell of cochlea	Present	Regionally restricted	4b	Expression in other supporting cells.

Structure	Cell Type	Level	Pattern	Image	Note
TS27: cochlear duct	cochlea auditory hair cell	Trace	Regionally restricted		Transient upregulated of expression in cochlear hair cells first very weakly seen in upper basal part at P2.

Structure	Cell Type	Level	Pattern	Image	Note
TS27: cochlear duct	cochlea auditory hair cell	Present	Regionally restricted	4c	No expression in hair cells in middle part.

Structure	Cell Type	Level	Pattern	Image	Note
TS27: cochlear duct	cochlea auditory hair cell	Present	Regionally restricted	4d	Expression transiently upregulated in cochlear hair cells. Increased expression in upper basal part.

Structure	Level	Pattern	Image	Note
TS28: cochlear duct	Present	Regionally restricted	4e	Expression does not extend into apex.

Structure	Level	Pattern	Image	Note
TS28: cochlear duct	Present	Regionally restricted	4f	Expression extends into middle part of cochlea.

Structure	Cell Type	Level	Pattern	Image	Note
TS28: cochlear duct	cochlear inner hair cell	Present	Regionally restricted	4g	Expression localized to inner hair cells and outer hair cells of upper basal and middle regions.
TS28: cochlear duct	cochlear outer hair cell	Present	Regionally restricted	4g	Expression localized to inner hair cells and outer hair cells of upper basal and middle regions.

Structure	Cell Type	Level	Pattern	Image	Note
TS28: cochlear duct	cochlear inner hair cell	Present	Regionally restricted	4h	Expression downregulated. Expression in several inner hair cells but only a few outer hair cells
TS28: cochlear duct	cochlear outer hair cell	Present	Regionally restricted	4h	Expression downregulated. Expression in several inner hair cells but only a few outer hair cells

Structure	Cell Type	Level	Pattern	Image	Note
TS28: cochlear duct	cochlea auditory hair cell	Absent		4i	Expression undetectable in cochlear hair cells.
TS28: cochlea	supporting cell of cochlea	Weak	Single cells	4i	Expression in a few laterally located supporting cells.

Structure	Cell Type	Level	Pattern	Image	Note
TS27: semicircular duct ampulla	vestibular hair cell	Present	Regionally restricted	4j	No expression in majority of utricular hair cells.
TS27: utricle	vestibular hair cell	Present	Regionally restricted	4j	No expression in majority of utricular hair cells.
TS27: utricle	supporting cell of vestibular epithelium	Strong	Uniform	4j	Prominent homogeneous expression in supporting cells.

Structure	Cell Type	Level	Pattern	Image	Note
TS28: utricle	supporting cell of vestibular epithelium	Present	Regionally restricted	4k	Expression maintained in small part of supporting cells.
TS28: utricle	vestibular hair cell	Present	Regionally restricted	4k	Expression in a few hair cells.

Structure	Cell Type	Level	Pattern	Image	Note
TS28: utricle	supporting cell of vestibular epithelium	Present	Regionally restricted	4l	Expression maintained in small part of supporting cells.
TS28: utricle	vestibular hair cell	Present	Regionally restricted	4l	Expression in a few hair cells.

Structure	Level	Pattern	Image	Note
TS21: cochlear duct epithelium	Present	Widespread	6a	Widely expressed in cochlear duct epithelium, including prosensory domain lacking Mki67 expression.

Structure	Cell Type	Level	Pattern	Image	Note
TS24: cochlear duct	cochlea auditory hair cell	Weak	Regionally restricted	6c	Expression downregulated in differentiated hair cells of basal part, but not in undifferentiated part of cochlea.

Structure	Cell Type	Level	Pattern	Image	Note
TS24: cochlear duct epithelium	cochlea auditory hair cell	Weak	Graded	6e , 6d	Expression downregulated in differentiated hair cells of basal part, but not in undifferentiated part of cochlea.
TS24: organ of Corti	cochlear inner hair cell	Absent		6d , 6e	No expression in first emerging inner hair cells.
TS24: organ of Corti	cochlear outer hair cell	Weak		6d , 6e	Decreased expression in outer hair cels.
TS24: cochlea	supporting cell of cochlea	Present	Regionally restricted	6d , 6e	Expression in different types of supporting cells.
TS24: cochlea	Deiter's cell	Weak	Graded	6d , 6e	Initiation of downregulation in Deiter's cells, in a base-to-apex gradient.

Structure	Cell Type	Level	Pattern	Image	Note
TS27: cochlear duct	cochlea auditory hair cell	Weak	Regionally restricted		Suppression of expression reached hair cells in apical region by P1.

Structure	Level	Pattern	Image	Note
TS21: utricle	Present	Widespread	6f	Broadly expressed in vestibular epithelia.

Structure	Cell Type	Level	Pattern	Image	Note
TS24: utricle	vestibular hair cell	Weak	Regionally restricted	6h	Expression disappeared from majority of differentiated utricular hair cells.
TS24: utricle	supporting cell of vestibular epithelium	Strong		6h	Strong expression persists in supporting cells.