<Tr> <Td_colspan="2"> Section through embryonic disk of Vespertilio murinus . </Td> </Tr> <Tr> <Th_colspan="2"> Details </Th> </Tr> <Tr> <Th> Days </Th> <Td> 16 </Td> </Tr> <Tr> <Th_colspan="2"> Identifiers </Th> </Tr>

Ectodermal and endodermal cells make the embryonic disc