<Tr> <Td> Temin, Howard </Td> <Td> 1934--1994 </Td> <Td> 1975 Nobel Prize in Physiology or Medicine </Td> </Tr> <Tr> <Td> Ramakrishnan, Venkatraman </Td> <Td> born 1952 </Td> <Td> 2009 Nobel Prize in Chemistry </Td> </Tr> <Tr> <Td> Roberts, Richard </Td> <Td> born 1943 </Td> <Td> 1993 Nobel Prize in Physiology or Medicine </Td> </Tr> <Tr> <Td> Sharp, Philip </Td> <Td> born 1944 </Td> <Td> 1993 Nobel Prize in Physiology or Medicine </Td> </Tr>

Who discovered rna and what did they contribute