<Table> <Tr> <Th_colspan="2"> show Search </Th> </Tr> <Tr> <Th> PMC </Th> <Td> articles </Td> </Tr> <Tr> <Th> PubMed </Th> <Td> articles </Td> </Tr> <Tr> <Th> NCBI </Th> <Td> proteins </Td> </Tr> </Table> <Tr> <Th_colspan="2"> show Search </Th> </Tr> <Tr> <Th> PMC </Th> <Td> articles </Td> </Tr> <Tr> <Th> PubMed </Th> <Td> articles </Td> </Tr>

In which environment does trypsin work the best