Analysis of the origin of putative G. intraradices genes represented on the Medicago GeneChip®. PCR amplification using DNA isolated from M. truncatula roots, G. versiforme spores or G. intraradices spores. MtPT4 and an ammonium transporter are positive controls for the M. truncatula. Primers designed to TC105406, a putative α-tubulin a1 gene amplify α-tubulin from both G. intraradices and G. versiforme. TC85704 is a G. versiforme gene.