Frequently identified causal mutations in osteochondrodysplasia arise in the coding sequences of the <i>FGFR3</i> gene: c.1138G>A and c.1138G>C in achondroplasia and c.1620C>A and c.1620C>G in hypochondroplasia. The gene discussed is FGFR3; the disease is osteochondrodysplasia.