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1st level, 2nd level, Tertiary, and Quaternary.

The first level is just the different protein groups forming peptide bonds to create a polypeptide

The second level consists of hydrogen bonds between the H and the O molecules in the proteins forming pleated and helical shapes

The Tertiary structure is the interactions of different R groups binding to each other (many different types of bonds happen between the R groups)

The Quaternary structure is many polypeptides interacting with each other

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