Use a simple text format where each sequence occupies two lines:
- Line 1: The header, which must start with `>` (e.g., `>name and ID`).
- Line 2: The raw sequence data on the next line.
Input Example for a single entry:
>hsa-mir-576 MI0003583
UACAAUCCAACGAGGAUUCUAAUUUCUCCACGUCUUUGGUAAUAAGGUUUGGCAAAGAUGUGGAAAAAUUGGAAUCCUCAUUCGAUUGGUUAUAACCA
For a file with multiple sequences, you would repeat this two-line block for each entry.