Rating of obtained polymerase chain reaction (PCR) products.

Rating of the PCR products obtained from using the degenerate oligonucleotide primers shown in Table 3 to amplify ten target genes in six apocritan Hymenoptera. ++ = target PCR product in excess. + = target PCR product sufficient for direct sequencing. +/− = target PCR product insufficient for direct sequencing. – = no target PCR product. (?) = unclear whether or not PCR products include amplicon of target gene. *Secondary PCR amplification product likely hampering direct sequencing.