Olfactory tissue-specific expression of Or2 genes in fig wasps. RT-PCR was performed with cDNAs prepared from different species and tissues of fig wasp. Reaction products were visualized by ethidium bromide staining and UV illumination. Bands were the expected size based on the primer design. A no-template negative control ensured the specificity of the amplification. Actin was amplified from each sample as a control for RNA integrity. CsmOr2, Ceratosolen solmsi Or2; AbOr2, Apocrypta bakeri Or2; PpOr2, Philotrypesis pilosa Or2; PsOr2, Philotrypesis sp. Or2; A, antenna; T, thorax; L, leg; Abd, abdomen; H, head; Neg, negative control.