Custom Modified Nucleotides - Analog Nucleoside Mono, Di and Triphosphates Today's chemistry... Tomorrow's medicine We specialize in the synthesis of the modified nucleoside mono, di and triphosphates. We can supply a wide variety of modified/analog nucleotides for anti-cancer research, anti-viral research, DNA/genetic research, PCR, mutagenesis, labeling, sequencing and more. Please contact us for a quotation.   © Sierra Bioresearch, Copyright 1980-2020 All rights reserved.