the deoxyribonucleotide and mrna concentrations and the temperature of incubation were optimized to obtain either a high specific activity cdna probe , 330 nucleotides long , which represented approximately 25 % of the mrna or a lower specific activity preparation containing some complete cdna copies , 1300 nucleotides in length .
C0011529
deoxyribonucleotide
C0028630
nucleotides