Primer3 Input -version 0.4.0- May 2026

PRIMER_PICK_LEFT_INPUT=1 # Start of left primer search region PRIMER_PICK_RIGHT_INPUT=500 # End of right primer search region To force primers to flank a specific SNP or target:

PRIMER_MISPRIMING_LIBRARY=/path/to/human_repeat_masked.lib PRIMER_MAX_MISPRIMING=12.00 # Maximum allowed mispriming score PRIMER_MAX_END_MISPRIMING=6.00 # Max mispriming score in last 5 bases : The mispriming scoring is more stringent. For highly repetitive targets, increase PRIMER_MAX_MISPRIMING to 15.0 . 6. Product Size Control PRIMER_PRODUCT_SIZE_RANGE=100-300 PRIMER_PRODUCT_OPT_SIZE=200 7. Internal Oligo (Probe) Parameters If PRIMER_TASK=pick_detection_primers , you can specify probe constraints. primer3 input -version 0.4.0-

The basic structure looks like this: