Nucleotides, Oligonucleotides, and Polynucleotides 271 Table 10.1 (Continued)% Triphosphate Form Months -70 C -20 C 4 C 21 C Powder dGTP 54 99.63 98.83 95.47 90.5 (2mo) 19.7 (42mo) dTTP 54 99.44 98.87 93.54 95.6 (2mo) 0.07 (42) dUTP 54 99.23 98.02 71