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Frequently asked questions

Our Scientific Applications Support team has assembled a list of frequently asked questions to help you find answers quickly. Filter using one or more categories to focus on specific topics, or use the search bar to perform a text search.

What is the length of gBlocks Gene Fragments that IDT can synthesize?

IDT can synthesize gBlocks fragments between 125 bp and 3 kb in length.

However, if you require a double-stranded DNA construct outside of this size range, we offer 2 options:

  1. We may be able to accept the sequence for synthesis as a custom gene.
  2. Our Synthetic Biology Support Specialists can assist in splitting larger sequences into multiple gBlocks fragments that can be used in an assembly reaction to generate the full-length construct.

If you are interested in a custom gene quote or assistance in splitting your sequence into sub-fragments, please email your sequences to