FASTA Combiner¶
Combines up to five FASTA inputs into a single FASTA string. It preserves the order of provided inputs (fasta_1 to fasta_5), trims surrounding whitespace, and ensures proper newline separation between concatenated blocks.
Usage¶
Use this node when you have multiple FASTA sequences (or multi-record FASTA strings) that need to be merged into a single FASTA input for downstream biotech/protein modeling workflows. Connect any subset of the fasta_1..fasta_5 inputs; empty or unconnected inputs are ignored.
Inputs¶
| Field | Required | Type | Description | Example |
|---|---|---|---|---|
| fasta_1 | False | FASTA | First FASTA sequence string. Can contain one or more records. | >seqA MKTAYIAKQRQISFVKSHFSRQ |
| fasta_2 | False | FASTA | Second FASTA sequence string. Optional; ignored if not connected or empty. | >seqB GHHHHHHHHHHHHHHHHH |
| fasta_3 | False | FASTA | Third FASTA sequence string. Optional. | >seqC AAAAGGGGCCCC |
| fasta_4 | False | FASTA | Fourth FASTA sequence string. Optional. | >seqD MVLSPADKTNVKAAW |
| fasta_5 | False | FASTA | Fifth FASTA sequence string. Optional. | >seqE TTTTTTTTTT |
Outputs¶
| Field | Type | Description | Example |
|---|---|---|---|
| combined_fasta | FASTA | A single FASTA string formed by concatenating all provided inputs in numeric order with proper newline separation. | >seqA MKTAYIAKQRQISFVKSHFSRQ >seqB GHHHHHHHHHHHHHHHHH |
Important Notes¶
- At least one input must be provided: If all inputs are empty or missing, the node raises an error.
- Order preserved: Inputs are concatenated in the order fasta_1 → fasta_5.
- Whitespace handling: Leading/trailing whitespace is trimmed; a newline is inserted between inputs when needed.
- No validation or deduplication: Headers and sequences are not modified or validated; duplicates remain as-is.
- Input limit: Supports up to five FASTA inputs.
Troubleshooting¶
- Error: 'At least one FASTA input is required': Connect at least one non-empty FASTA input.
- Merged records run together: The node inserts a newline between inputs if needed, but ensure each input itself is valid FASTA with proper newlines.
- Unexpected order of sequences: Verify you connected sequences to the intended slots (fasta_1..fasta_5) to control ordering.
- Stray blank lines: Inputs are trimmed; if you see unexpected spacing inside records, check the original FASTA formatting.
- Duplicate headers: The node does not modify headers; adjust upstream inputs if unique headers are required.
Example Pipelines¶
