.Levelling off stage: The reaction slows as the DNA polymerase loses activity and as consumption of reagents such as dNTPs and primers causes them to become limiting.^ But with the new Taq Bead TM , the researcher simply puts one bead into each 0.5 ml reaction tube and adds the other reagents: the DNA template to be amplified; the primers; buffer; magnesium chloride; and the four deoxynucleotide t