Antibody:	anti-FGFR1
Detection system:	horseradish peroxidase

Structure	Level	Pattern	Image	Note
TS20: lateral ventricle choroid plexus epithelium	Present		1A	At E12.5, expression in epithelial cells and mesenchymal cells. No difference in intensity between lateral ventricle and 4th ventricle choroid plexuses.
TS20: lateral ventricle choroid plexus stroma	Present		1A	At E12.5, expression in epithelial cells and mesenchymal cells. No difference in intensity between lateral ventricle and 4th ventricle choroid plexuses.

Structure	Level	Pattern	Image	Note
TS20: 4th ventricle choroid plexus epithelium	Present		1B	At E12.5, expression in epithelial cells and mesenchymal cells. No difference in intensity between lateral ventricle and 4th ventricle choroid plexuses.
TS20: 4th ventricle choroid plexus stroma	Present		1B	At E12.5, expression in epithelial cells and mesenchymal cells. No difference in intensity between lateral ventricle and 4th ventricle choroid plexuses.

Structure	Level	Pattern	Image	Note
TS23: lateral ventricle choroid plexus epithelium	Absent		1C	Expression barely detectable in epithelium and mesenchyme, compared with levels seen at E12.5
TS23: lateral ventricle choroid plexus stroma	Absent		1C	Expression barely detectable in epithelium and mesenchyme, compared with levels seen at E12.5

Structure	Level	Pattern	Image	Note
TS23: 4th ventricle choroid plexus epithelium	Absent		1D	Expression barely detectable in epithelium and mesenchyme, compared with levels seen at E12.5
TS23: 4th ventricle choroid plexus stroma	Absent		1D	Expression barely detectable in epithelium and mesenchyme, compared with levels seen at E12.5

Structure	Level	Pattern	Image	Note
TS23: cornea epithelium	Present		1E	Expression in layers of neural retina, corneal epithelium, and mesenchymal tissue of eyelid.
TS23: eyelid mesenchyme	Present		1E	Expression in layers of neural retina, corneal epithelium, and mesenchymal tissue of eyelid.
TS23: neural retina	Present		1E	Expression in layers of neural retina, corneal epithelium, and mesenchymal tissue of eyelid.

Structure	Level	Pattern	Image	Note
TS26: 4th ventricle choroid plexus epithelium	Trace		1F	Slight expression in epithelium, similar to generalized low level immunoractivity of CNS and ependyma.
TS26: 4th ventricle choroid plexus stroma	Absent		1F
TS26: hindbrain	Ambiguous	Regionally restricted	1F	Very low expression in periventricular central nervous system tissues.

Structure	Level	Pattern	Image	Note
TS20: choroid plexus epithelium	Strong
TS20: choroid plexus stroma	Present
TS20: ventricle ependyma	Strong			Expression in ependymal cells lining the ventricle.
TS20: brain	Present	Regionally restricted		Expression in periventricular central nervous system tissue. Expression in neuronal cells, partiularly in regions closest to ventricles.

Structure	Level	Pattern	Image	Note
TS23: choroid plexus epithelium	Absent
TS23: choroid plexus stroma	Absent
TS23: ventricle ependyma	Absent
TS23: brain	Absent			No expression in periventricular central nervous system tissue.

Structure	Level	Pattern	Image	Note
TS26: choroid plexus epithelium	Trace			Slight expression in epithelium, similar to generalized low level immunoractivity of CNS and ependyma.
TS26: choroid plexus stroma	Absent
TS26: ventricle ependyma	Absent
TS26: brain	Absent			absent No expression in periventricular central nervous system tissue.
TS26: salivary gland	Strong