Which of the following statements is false?
(a) mutations in the kit receptor are seen in familial cancer syndromes
(b) cytoskeleton-associated proteins are ligands for integrins
(c) src is a tyrosine kinase
(d) in the jak-stat pathway, ligand binding promotes phosphorylation, dimerization and nuclear translocation of transcription activators
(e) in normal cells, rtk dimerization and autophosphorylation (transphosphorylation) are dependent on ligand binding.