Compared amino acid sequence of the C-terminal region of the CNP precursors of several vertebrates. DNP, Dendroaspis ANP (14); BJ, Bothrops jararaca; H-CNP, human CNP (17); P-CNP, pig CNP (17); C-CNP, chicken CNP (20); B-CNP, bullfrog CNP (21); E-CNP, eel CNP (22).