<Tr> <Td_colspan="1"> <P> 4803 </P> </Td> </Tr> <Table> <Tr> <Th_colspan="1"> </Th> </Tr> <Tr> <Td_colspan="1"> <P> 18049 </P> </Td> </Tr> </Table> <Tr> <Td_colspan="1"> <P> 18049 </P> </Td> </Tr> <Tr> <Th> Ensembl </Th> <Td> <Table> <Tr> <Th_colspan="1"> </Th> </Tr> <Tr> <Td_colspan="1"> <P> ENSG00000134259 </P> </Td> </Tr> </Table> </Td> <Td> <Table> <Tr> <Th_colspan="1"> </Th> </Tr> <Tr> <Td_colspan="1"> <P> ENSMUSG00000027859 </P> </Td> </Tr> </Table> </Td> </Tr>

What is signaled by nerve growth factor (ngf)