Total RNA was extracted using the RNeasy Micro Kit after the manufacturer’s instructions.
The RNA obtained free of genomic contamination was used for reverse transcription followed by amplification using specific primers designed from equine sequences by use of Basic Local Alignment Search Tool (BLAST) primer design tool . Qualitative reverse transcriptase PCR, separation by electrophoresis and visualization, was performed as described . The bands were cut out from the gel, and cleaned and sequenced using the amplification primers . Finally, the sequences were compared with the database by BLAST algorithm.