Keywords: RT-PCR; reverse transcription polymerase chain reaction; MEP; methylerthiol 4-phosphate; IDP; isopentenyl diphosphate; DMADP; dimethylallyl diphosphate; GPP; geranyl diphosphate; FDP; farnesyl diphosphate; GGPPS; geranylgeranyl diphosphate synthesis; DXR;