KX Modifier - SPECIFIC REQUIRED DOCUMENTATION ON FILE. KX -- SPECIFIC REQUIRED DOCUMENTATION ON FILE. (EFFECTIVE DATE 7/1/2002) This modifier may be used to indicate that specific required documentation is on file in the patient's medical record. Documentation must be submitted upon request.
Proteins are made of amino acids hooked end-to-end like beads on a necklace. To simulate. a protein, you will make a model of your protein using a long chenille stem (the fuzzy. covered wire) and colored beads.
How are proteins made? To make a protein, a cell must put a chain of amino acids together in the right order. RNA is similar to DNA: it consists of strands of four different chemical building blocks, or bases, attached to a chemical backbone. All proteins are made up of combinations of 20 different amino acids.