In the description of protein structure, in particular in the Protein Data Bank file format, a heteroatom record (HETATM) describes an atom as belonging to a small molecule cofactor rather than being part of a biopolymer chain.
U opisu proteinske strukture, specifično u fajl formatu Proteinske banke podataka, heteroatomski record (HETATM) označava atom koji pripada malom molekulu (npr. kofaktoru) umesto biopolimernog lanca.