We have different kind of cells in our body. Since they all have same DNA,

A

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why are they different? A) Each cell uses a different set of promoters.
B) The proteins in the cells are made from the same genes, but of different amino acids.
C) The DNA contains different amino acids in different cells.
D) Each cell uses a different genetic code to read the genes.
E) All of the above are differences.
 
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