We are upgrading your website experience! Click here for more information. TechVault PRODUCT DNA/RNA Synthesis Gene Silencing and Small RNAs Genotyping GMP Manufacturing Modifications Molecular Biology Reagents NextGen Sequencing PCR/qPCR Purification QC Information RNase H2 SciTools Applications Synthetic Biology APPLICATION Cloning and Fragment Assembly Gene Silencing and Small RNAs General Oligo Use Genotyping Mutagenesis NextGen Sequencing Oligo Characteristics PCR/qPCR CUSTOMER SUPPORT Account Ordering Pricing and Payment Shipping and Turnaround FAQ/ Tags Are N and K the only mixed bases are allowed for gBlocks Gene Fragments? Can I order multiple variable regions in my gBlocks Gene Fragment? What are the N and K mixed bases that can be incorporated into the variable regions of gBlocks Gene Fragments? What if I need a gBlocks Gene Fragment library that is more complex than what you offer online? What quality checks do gBlocks Gene Fragments with variable bases receive? Why am I limited to 18 N or K mixed bases in my gBlocks Gene Fragment?