Two conserved regions in the alignment of cytochrome P450 family 4 (CYP4) proteins served as guide to the synthesis of degenerate oligonucleotide primers. The primers were used in PCR from a midgut cDNA library and RT-PCR from fat body mRNA, both from last instar larvae of the tobacco hornworm,
Several related cytochrome P450 cDNAs belonging to the CYP9 family have been cloned from the midgut of larval tobacco hornworms, Manduca sexta. The first P450, CYP9A2, was obtained by RT-PCR using degenerate primers. Northern blot analysis of expression in the midgut using the CYP9A2 probe revealed
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