DNA is composed of units called nucleotides arranged into two long polynucleotide chains, resulting in a double helical structure. Nucleotides contain a phosphate group, a sugar group and a nitrogen base. There are four types of nitrogen bases namely adenine (A), thymine (T), guanine (G) and cytosine (C). The arrangement of these bases establishes the […]
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Invbio Saliva Test
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