(A–E) Lateral views of six month old sox9b:EGFP transgenic fish. (B) Area boxed in (A). Expression is detected in the spinal cord and vertebrae. (C) Magnification of the sox9b:EGFP expressing growth plates in the vertebrae. (D) Muscle associated with the tail fin and rays within the tail fin express sox9b:EGFP. (E) Magnification of the box in (D). Asterisks mark the muscle while arrows point to the rays. Scale bars in (A,D), 150 microns. Scale bars in (B,C,E), 50 microns.