How to take exon sequence of a gene for multiple species??

Question

[Naresh]

I need to take exon sequence of MSTN gene of myotis davidii and then compare it with various species MSTN exon. for eg. MSTN gene has 3 exons. but i wish to take only exon 1 sequence.. not exon 2 or exon 3.

Please tell me whether there is any database or manually in NCBI we need to take it? if it was for one or two genes, we can take. but i need to take it for 50 species.

Please guide me.

Thank you

[Naresh]

Please excepting any answer for this question?