Category Nuances for null:

• endogenous,
• acid,
• physiologic,
• natural,
• biological,
• large,
• single,
• intravenous,
• mammalian,
• abundant,
• smaller,
• major,
• stabilizing,
• denatured,
• dissolved,
• spherical,
• active,
• concentrated,
• size,
• secretory,
• globular,
• interfering,
• salivary,
• native,
• common,
• primary,
• nitrogenous,
• binding,
• nonpolar,
• proteinaceous,
• charged,
• heavy,
• conventional,
• clinical,
• relevant,
• small,
• colloidal,
• molecular,
• important,
• digestible,
• low,
• additional,
• vital,
• hydrophilic,
• sized,
• conjugated,
• exogenous,
• simple,
• available,
• soluble,
• standard,
• refractory,
• animal,
• functional,
• critical,
• acidic,
• individual,
• toxic,
• valuable,
• reactive,
• protective,
• therapeutic,
• urinary,
• physiological,
• inert,
• desirable,
• biologic,
• fine,
• whole,
• biodegradable,
• extracellular,
• unwanted,
• isolated,
• chemical,
• biochemical,
• destructive,
• visceral,
• larger,
• stable,
• genetic,
• anionic,
• useful,
• necessary,
• objective,
• nutrient,
• smooth,
• pharmaceutical,
• weak,
• organic,
• essential,
• typical,
• macromolecular,
• intact,

Simple Categories for null:

• protein,
• group,
• substance,
• compound,
• preparation,
• system,
• macromolecule,
• solute,
• component,
• activator,
• variable,
• material,
• chemical,
• molecule,
• stabilizer,
• carrier,
• polymer,
• acid,
• resin,
• particle,
• fluid,
• measure,
• constituent,
• acceptor,
• substrate,
• affinity,