Fig. 3From: Application of biological and single-strand conformation polymorphism assays for characterizing potential mild isolates of Citrus tristeza virus for cross protectionRT-PCR products of CP gene about 672 bp. In lane 1 and 16 DNA marker with 100 bp ladder; while lane 11 and 24 CTV-negative sample (by DTBIA); 29, positive control; 30, negative control and rest of the samples from 8 citrus growing areas of Punjab were also positive by DTBIABack to article page