Expression of numit rps13 and mt rps13 from in Malus in different organ types. Plus signs indicate reactions containing reverse transcriptase (RT) and minus signs indicate reactions without RT. Abbreviations: coty, cotyledon; g, genomic; hypo, hypocotyl; m, marker. (A) A gel showing a subset of the RT-PCR products of numit rps13 (457 bp). Sequencing of a larger band in RT-PCR assays of numit rps13 revealed that it was due to non-specific primer binding, whereas the smaller band was the numit rps13. (B) A gel showing a subset of the RT-PCR products of mt rps13 (305 bp).