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.
Ribosomes may be attached to the SER or free in the cytoplasm and are the factories that manufacture proteins. Proteins are one of the principal building materials that the cell uses. Some proteins are enzymes-tiny machines that perform necessary chemical reactions within the cell.