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gene is a countable noun but people always say genes, so what is A gene?

for instance, Each chromosome contains many genes, so, which part of the chromosome of Escherichia coli could be A gene?

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There are about 20,000 genes in the human genome. Here are the first 5 genes (following alphabetical order) on chromosome 1:

  • AADACL3: Arylacetamide deacetylase-like 3
  • AADACL4: Arylacetamide deacetylase-like 4
  • ACADM: acyl-Coenzyme A dehydrogenase, C-4 to C-12 straight chain
  • ACTL8: Actin-like 8
  • ADGRL2 (1p31.1): adhesion G protein-coupled receptor L2
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