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	original_column_name,data_format,combined_description
	atom_id,text,the unique id of atoms
	molecule_id,text,identifying the molecule to which the atom belongs. TRXXX_i represents the ith atom of molecule TRXXX
	element,text,"the chemical element of the atom, using standard lowercase symbols (e.g., c, h, o, n, s, cl, br, f, p, na, i, sn, pb, ca, zn, k, cu, y)"

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