Get Help Sign In

eBlocks Gene Fragments

Made for speed

eBlocks Gene Fragments are double-stranded DNA fragments of 300–900 bp in length. They are uniquely suited for high-throughput screening of multiple constructs, especially for antibody discovery scientists who want to obtain DNA constructs quickly and reliably for most cloning applications.

  • FAST time to ship (1–3 business days from order confirmation)
  • Budget friendly
  • Low screening effort to find your clone


eBlocks Gene Fragments

Orders require a minimum of 24 fragments per plate. Resuspended in 20 μL of nuclease-free water (concentration: 10 ng/μL). Shipped on dry ice and delivered within 1–3 business days of order confirmation (excluding Fridays).


To achieve the fastest possible shipping time, all items that do not meet QC requirements after the first assembly attempt will be cancelled and refunded. No formal cancellation notice will be sent for these items. However, cancellations will be noted on the item specification sheet.

eBlocks Gene Fragments are double-stranded DNA fragments of 300–900 bp in length that are delivered in 1–3 business days (Table 1). They are uniquely suited for high-throughput screening of multiple constructs. With no adapter sequences to remove, eBlocks Gene Fragments are ready to use.

eBlocks Gene Fragments are a flexible alternative, especially for antibody discovery scientists who want to obtain DNA constructs quickly and reliably. Additional downstream applications include enzyme engineering and vaccine research.

Table 1. eBlocks Gene Fragments specifications

Minimum order 24 eBlocks Gene Fragments
Length300–900 bp
Yield 200 ng
Volume20 µL*
Concentration10 ng/µL*
Time to ship1–3 business days of order confirmation (excluding Fridays)

* Products shipped in Echo® Qualified Microplates (Labcyte), Matrix® 96-well tube racks (Thermo Fisher Scientific), and FluidX 96-well tube racks (Brooks Life Sciences) will be shipped in 50 µL at 4 ng/µL.
† Shipping time is dependent on length and complexity of the eBlocks Gene Fragments ordered. In a few cases, shipping time may exceed the estimated time.

Storage conditions

Short term (<2 weeks)4°C
Long term (up to 2 years)–20°C

Robust and flexible assembly

Thorough quality control testing of each eBlocks Gene Fragment ensures consistently high cloning rates for generating recombinant colonies. eBlocks Gene Fragments are compatible with many convenient cloning and assembly kits. Table 2 demonstrates the number of colonies needed to be picked to have a >90% chance of obtaining a desired clone.

Table 2. Low screening effort is needed for eBlocks Gene Fragments to find the correct clone.

LengthColonies to pick

User guides and protocols

Flyers and brochures

Frequently asked questions

Sequence Information is secure and confidential at IDT. Please see our Confidentiality Statement for more information. All online ordering steps, including sequence entry and your choice of parameters, are also secure and protected.

We screen the sequence of every gene fragment order we receive to (1) identify any regulated and other potentially dangerous pathogen sequences, and (2) verify that IDT’s gene customers are legitimate scientists engaged in beneficial research.

IDT is among the five founding members of the International Gene Synthesis Consortium (IGSC) and helped to create the IGSC’s Harmonized Screening Protocol. The Harmonized Screening Protocol describes the gene sequence and customer screening practices that IGSC member companies employ to prevent the misuse of synthetic genes. IDT takes the steps set out in the Harmonized Screening Protocol to screen the sequences of ordered genes and the prospective customers who submit those orders.

For more information about the IGSC and the Harmonized Screening Protocol, please visit the website at


In October 2010, the United States government issued final Screening Framework Guidance for Providers of Synthetic Double-Stranded DNA, describing how commercial providers of synthetic genes should perform gene sequence and customer screening. IDT and the other IGSC member companies supported the adoption of the Screening Framework Guidance, and IDT follows that Guidance in its application of the Harmonized Screening Protocol. For more information, please see 75 FR 62820 (Oct. 13, 2010), or