"Interacting selectively with one or more specific sites on a receptor molecule, a macromolecule that undergoes combination with a hormone, neurotransmitter, drug or intracellular messenger to initiate a change in cell function [goid 5102] [evidence IEA]; Interacting selectively with one or more specific sites on a receptor molecule, a macromolecule that undergoes combination with a hormone, neurotransmitter, drug or intracellular messenger to initiate a change in cell function [goid 5102] [evidence IEA]; The function that links a sequence-specific transcription factor to the core RNA polymerase II complex but does not bind DNA itself [goid 3712] [pmid 15073182] [evidence IDA]; The function that stimulates a cell to grow or proliferate. Most growth factors have other actions besides the induction of cell growth or proliferation [goid 8083] [pmid 11389077] [evidence IDA]; The function that stimulates a cell to grow or proliferate. Most growth factors have other actions besides the induction of cell growth or proliferation [goid 8083] [pmid 8096067] [evidence NAS]; Increases the activity of a protein tyrosine kinase, an enzyme which phosphorylates a tyrosyl phenolic group on a protein [goid 30296] [pmid 7556068] [evidence IDA];  [goid 30297] [pmid 9553078] [evidence IC ];  [goid 30297] [pmid 1348215] [evidence NAS];  [goid 30297] [pmid 1350381] [evidence NAS]; Interacting selectively with a receptor that possesses protein tyrosine kinase activity [goid 30971] [pmid 1348215] [evidence NAS]; Interacting selectively with a receptor that possesses protein tyrosine kinase activity [goid 30971] [pmid 1350381] [evidence NAS]; Interacting selectively with the protein-tyrosine kinase receptor ErbB-3/HER3 [goid 43125] [pmid 7556068] [evidence IDA]; Interacting selectively with the protein-tyrosine kinase receptor ErbB-3/HER3 [goid 43125] [pmid 11389077] [evidence IPI]; Elemental activities, such as catalysis or binding, describing the actions of a gene product at the molecular level. A given gene product may exhibit one or more molecular functions [goid 3674] [evidence ND ]; Functions to control the survival, growth, differentiation and effector function of tissues and cells [goid 5125] [pmid 10372964] [evidence TAS]; The function that stimulates a cell to grow or proliferate. Most growth factors have other actions besides the induction of cell growth or proliferation [goid 8083] [evidence IEA]"