A fragment of rrnL from A. florea and A. andreniformis workers amplified and run on an EtBr stained, 3.5% agarose gel. Lanes 1, 3 and 5 are A. florea workers and lanes 2, 4 and 6 A. andreniformis workers. All workers originated from different colonies. Edge lanes are 20 bp molecular ladder (EZ Load, BIO-RAD).