bhq-1 cpg is used to add the non-fluorescent quencher bhq-1 to the 3' end of an oligonucleotide. bhq-1 quencher has maximal absorption in the 480 to 580 nm range, which provides excellent quenching of fluorophores emitting in this range, eg fluorescein, tet, joe, hex, etc. bhq-1 glycolate cpg has a glycolate linkage to the cpg support. the glycolate linker allows for rapid cleavage of the oligonucleotides and is labile enough for base sensitive oligonucleotides. the 1000 å cpg is best suited for the synthesis of dna sequences up to 100-mers in length.