version 0.4.0 is a legacy web-based interface and command-line tool widely used in molecular biology for designing Polymerase Chain Reaction (PCR) primers . While newer versions like 4.0.0 and interfaces like Primer3Plus exist, version 0.4.0 remains a standard reference in many published protocols due to its stability and straightforward parameter set. Tartu Ülikool Key Functional Areas Sequence Input : Users provide a DNA sequence (FASTA format is common but not strictly required ) to identify optimal forward and reverse primers. Targeting & Exclusion
If you see multiple bands, your primers might be binding to similar sequences elsewhere in the genome. Always BLAST your Primer3 results against your target species' database to ensure unique binding. primer3 0.4.0
The tool rigorously enforces stability at the 3' end to prevent "primer-dimer" artifacts. v0.4.0 allows fine-tuning of PRIMER_MAX_END_STABILITY and PRIMER_MAX_POLY_X (limiting runs of a single nucleotide, e.g., GGGG). version 0