Synthetic Biology
Support and Educational Content

Accelerate your recombinant gene or protein development

gBlocks® Gene Fragments Libraries—dsDNA fragment pools with variable sequences

With gBlocks® Gene Fragments Libraries expand IDT's popular synthetic biology gBlocks Gene Fragments product line to include 251–500 bp dsDNA fragments containing up to 18 consecutive N or K bases (see Definitions box, below). The regions of the gene fragments that are ordered as fixed sequences containing  A, G, C, or T bases are sequence-verified, while a proprietary manufacturing method ensures homogeneous distribution of the variable N or K bases.

gBlocks Gene Fragments Libraries are the ideal tool to generate up to 418 sequence variations useful in functional screening of nucleotide or peptide variants in numerous scientific applications. In addition, depending on the number of variations tested, gBlocks Gene Fragments Libraries can reduce the cost of an individual sequence to a fraction of $1 (USD) per construct.

Learn more about gBlocks Gene Fragment Libraries.


N and K are standard IUBMB (International Union of Biochemistry and Molecular Biology) identifiers for unspecified or incompletely specified nucleotide bases, where N can be an A, G, C, or T base; and K is either a G or T base.

gBlocks® Gene Fragments

Double-stranded DNA up to 3,000 kb—great for easy gene construction, CRISPR genome editing, and more.

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