Quantitative PCR (qPCR) was performed to measure the density of Wolbachia in W-Aag-2 cells, as described previously (Tortosa et al., 2008). In brief, genomic DNA was extracted and wAlbB was amplified with the forward primer 183F (5'-AAGGAACCGAAGTTCATG-3') and the reverse primer QBrev2 (5'-AGTTGTGAGTAAAGTCCC-3'), which are specific for the Wolbachia surface protein (wsp) gene. The Wolbachia genome copy was normalized with the host rps6 gene.
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