<Ul> <Li> 638678 </Li> </Ul> <Tr> <Th> IUPHAR / BPS </Th> <Td> <Ul> <Li> 2139 </Li> </Ul> </Td> </Tr> <Ul> <Li> 2139 </Li> </Ul> <Tr> <Th> ChemSpider </Th> <Td> <Ul> <Li> 554166 </Li> </Ul> </Td> </Tr>

Which hormone level to be raised to control tsh releasing factor