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.
There are four types of protein structure: 1  Primary Structure: sequence of amino acids in the chain. 2  Secondary Structure: the shape of the protein molecule caused by hydrogen-bonding between -C=O and -N-H groups within the chain. 3  Tertiary Structure: the interaction between R-groups that causes folding and bending.