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Semiquantitative RT-PCR analyses of CNP and NPR-B expression in sperm or testes coamplified with GAPDH. RT-PCR: reverse transcription polymerase chain reaction; CNP: C-type natriuretic peptide; NPR-B: natriuretic peptide receptor-B, GAPDH: glyceraldehyde-3-phosphate dehydrogenase.
