hi,

I have a long list of different miRNAs like below

    hsa-miR-7641
    bta-miR-2904
    hhi-miR-7641
    hsa-miR-4454
    bta-miR-2478
    efu-let-7c
    mmu-miR-6240
    hsa-miR-7704

is there any way to avoid searching one by one in mirbase and copy pasting their mature sequences and taking their sequences at the same time?
It looks like you can download sequence files:
http://www.mirbase.org/ftp.shtml

"Fasta format sequences of all miRNA hairpins" & "Fasta format sequences of all mature miRNA sequences"

When you have those files, a simple `grep -f <youridentifiers.txt> <mirbase.fasta>` would do the trick