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.
In some cases, there are various intermediates produced during protein synthesis. For example, some proteins destined for the mitochondria have an N-terminal tag that's cleaved when the proteins reach their destination. There are two different versions of the protein but, again, this isn't really a big deal. We should really only count the steady-state, terminal, stage of processing and modification.