FGFR3 and chondrodysplasia: The anatomical features used to classify these diseases range from the tissue (chondrodysplasia or osteodysplasia) or cell affected (i.e., osteoclasts dysfunction in osteopetrosis), the severity of phenotype (achondroplasia vs. hypochondroplasia), specific genotype/phenotype relationships (FGFR3 chondrodysplasia and collagenopathies), cell functions affected (i.e., ciliopathies or cohesinopathies), or even the specific cell pathologies involved (i.e., ER-cell stress).