What is the measuring unit for any given element?

The mass of atoms and subatomic particles is measured using atomic mass units (abbreviated amu); protons and neutrons have a mass of one amu, and the mass of an electron is negligible. ... The atomic mass of an element is the weighted average of the masses each of these isotopes

Explanation:

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If it's related to chemistry it's measured in atomic mass unit or simply amu.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.