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DNA
Inside every cell is a control center called the nucleus.
The nucleus gives instructions to the body and these instructions are in a molecule called DNA.
DNA fits in the body by being scrunched up into chromosomes. The double helix is wrapped around proteins which form these chromosomes.
Every human cell has 46 chromosomes and since there are several trillion cells in an adult human body, that's a lot of DNA!
DNA looks like a ladder. It's called a 'Double Helix. Each step of the ladder has either letters A, C, T, or G. A gets paired with T and C gets paired with G.
