I am staring at the miRNAs and mature miRNAs FASTA files I downloaded from one of the BioMart database
The file format is as follows:

>hsa-miR-26a MIMAT0000082 Homo sapiens miR-26a
UUCAAGUAAUCCAGGAUAGGCU
>hsa-miR-26b MIMAT0000082 Homo sapiens miR-26b
UUCAAGUAAUUCAGGAUAGGU
>hsa-miR-27a MIMAT0000084 Homo sapiens miR-27a
UUCACAGUGGCUAAGUUCCGC
>hsa-miR-28-5p MIMAT0000085 Homo sapiens miR-28-5p
AAGGAGCUCACAGUCUAUUGAG

So far, for each miRNA identifier, from the FASTA files above mentioned, I looked for it in the Excel file I downloaded
 from miRecords to read out the gene identifiers that link a single validated miRNA to its target genes, and get 
 the correspondent 3utr sequences. 

My questions are:

1) I'd like to double-check that the miRNAs in the FASTA files above mentioned are 
     really VALIDATED not just predicted. Is that true ?

2) Can I extract  the target-genes 3UTR sequence providing BioMart functions with  the identifiers present 
     in the FASTA files above mentioned  ("MIMAT0000082", "MIMAT0000082", "MIMAT0000085", and so on ...) 
     What is the attribute name for such identifiers?

Thank you in advance.
Regards,
Maura


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