[On the problem of the specific interrelation of purine and pyrimidine in the nucleic acid chain].
D009696:Nucleic Acids; D011687:Purines; D011743:Pyrimidines; D013057:Spectrum Analysis
D009696:Nucleic Acids; D011687:Purines; D011743:Pyrimidines; C030986:pyrimidine; C030985:purine
NUCLEIC ACIDS; PURINES; PYRIMIDINES; SPECTRUM ANALYSIS