Fibroblast-growth-factor receptors (FGFRs) members of the tyrosine-kin
ase receptor family, play a crucial role in signal transduction and de
velopment. Recently, unique mutations in three human FGFR-encoding gen
es (FGFR1-3) bare been identified as tbe cause of a variety of skeleta
l disorders. Comparison of these specific mutations with the resulting
phenotypes is now providing new insight into the role of these recept
ors in normal and abnormal bone development.