The oligo(dT)18 primer is widely used in molecular biology for reverse transcription of mRNA into complementary DNA (cDNA). It specifically binds to the poly-A tail of eukaryotic mRNA, enabling the synthesis of cDNA from RNA templates. This is a critical step in gene expression studies, RT-PCR, and cDNA library construction. It is also employed in RNA sequencing (RNA-seq) to analyze transcriptomes and study gene regulation. Additionally, it aids in the detection and quantification of mRNA levels in various biological samples, making it essential for research in genetics, genomics, and molecular diagnostics.