| Tyrosine kinase type receptor ErbB 4 in chondrocytes : interaction with connective tissue growth factor and distribution in cartilage . ^^^ The mRNA expression of one such receptor , ErbB 4 , was increased by connective tissue growth factor / hypertrophic chondrocyte specific gene product ( CTGF / Hcs24 ) , which promotes all stages of the endochondral ossification in vitro . ^^^ |