Fig. 1From: A novel class III endogenous retrovirus with a class I envelope gene in African frogs with an intact genome and developmentally regulated transcripts in Xenopus tropicalisCloning of XtERV-S. Positions are shown for PCR products PCR1-3 (grey boxes) and the locations of the primers (dashed lines and black arrowheads). Also shown are the PCR product sizes and the positions of restriction sites used for cloning and assembly of the provirus in the pBluescript SK(+) vectorBack to article page