<Tr> <Th_colspan="2"> Details </Th> </Tr> <Tr> <Th> System </Th> <Td> Immune system </Td> </Tr> <Tr> <Th> Function </Th> <Td> White blood cell </Td> </Tr> <Tr> <Th_colspan="2"> Identifiers </Th> </Tr>

Where would peripheral blood most likely be obtained from