guanine

chemical

formula

dna

rna

base

structural

nitrogen

chemistry

atomic

structure

molecule

nucleotide

laboratory

atom

molecular

bond

science

substance

purine

compound

medicine

acid

organic

element

composition

information

skeletal

hydrogen

nitrogenous

biotechnology

health

line

pharmacology

education

link

metabolism

replication

ring

data

pharmacy

biology

genetic

genes

biochemistry

synthesis

vital

cyclic