
Fig. 4. Elbow and knee joint fusion in homozygous ColII-FGFR31ach transgenic mice (line 2) at E15.5. (A,B) Elbow joint of wild-type (A) and ColII-FGFR31ach transgenic line 2 (B). (C,D) Knee joints of wild-type (C) and ColII-FGFR31ach transgenic line 2 (D). f, femur; h, humerus; t, tibia; u, ulna.