\input zb-basic \input zb-ioport \iteman{io-port 05436939} \itemau{Seela, Frank; Roling, Angelika} \itemti{7-deazapurine containing DNA: Efficiency of c7gdtp, c7adtp and c7idtp incorporation during PCR-amplification and protection from endodeoxyribonuclease hydrolysis.} \itemso{Nucleic Acids Res. 20, No. 1, 55-61 (1992).} \itemcc{} \itemut{} \itemli{doi:10.1093/nar/20.1.55} \end