In our study, ectopic cartilage was also observed adjacent to osteochondroma-like lesions connected to the side of growth plate cartilage in Fgfr3−/− mice (S4I–S4P Fig); however, we were unable to determine the precise anatomical location due to structural changes caused by the presence of chondroma-like lesions. The gene discussed is FGFR3; the disease is Osteochondroma.