Modifiers matching nucleotide:

• natural,
• extracellular,
• active,
• endogenous,
• cellular,
• key,

Simple categories matching active:

• growth,
• metal,
• substance,
• condition,
• problem,
• ester,
• material,
• ligand,
• infection,
• compound,
• stimulation,
• food,
• restoration,
• sport,
• mixer,
• activity,
• phytochemical,
• recreation,
• muscle,
• cancer,
• molecule,
• br,
• component,
• amusement,
• elimination,
• tissue,
• predator,
• organism,
• alarm,
• hydrogen,
• micronutrient,
• property,
• virus,
• thing,
• endeavour,
• corticoid,
• motion,
• group,
• system,
• basin,
• array,
• catalyst,
• fraction,
• herb,
• date,
• interaction,
• load,
• devices,
• creature,
• radiator,
• phenomenon,
• chlorine,
• adulterant,
• situation,
• individual,
• organization,
• movement,
• widget,
• product,
• invertebrate,
• instrument,
• database,
• progestin,
• directory,
• atmosphere,
• protein,
• agent,
• support,
• acid,
• relative,
• waterway,
• plant,
• part,
• solute,
• ectotherm,
• shoes,
• teleost,
• benzodiazepine,
• area,
• unit,
• switch,
• falcon,
• radar,
• antibiotic,
• prey,
• fauna,
• line,
• institution,
• party,
• effort,
• glucocorticoid,
• module,
• holiday,
• organs,
• experience,
• toy,
• carbon,
• exercise,
• amine,
• clay,
• code,
• income,
• practice,
• defence,
• graphics,
• issue,
• carrier,
• mineral,
• medicine,
• form,
• connection,
• competition,
• use,
• endeavor,
• facility,
• rest,
• sensation,
• ingredient,
• fabric,
• precursor,
• lysozyme,
• usage,
• worm,
• domain,
• command,
• passion,
• substrate,
• estrogen,
• foundation,
• society,
• androgen,
• class,
• rift,
• anesthetic,
• protocol,
• defense,
• buffer,
• halogen,
• contaminant,
• soil,
• packing,
• drug,
• content,
• galaxy,
• cell,
• card,
• user,
• modality,
• function,
• carotenoid,
• backpacker,
• pigment,
• metabolite,
• place,
• steroid,
• iud,
• participation,
• illness,
• ministry,
• alcohol,
• task,
• subsystem,
• entertainment,
• display,
• proteinase,
• solid,
• people,
• disorder,
• crime,
• nekton,
• science,
• block,
• male,
• equipment,
• touch,
• agonist,
• mammal,
• fish,
• lesion,
• control,
• medium,
• phagocyte,
• option,
• subject,
• preparation,
• sentiment,
• limb,
• state,
• behaviour,
• employment,
• safety,
• structure,
• carnivore,
• person,
• sensor,
• species,
• depressant,
• sedative,
• corticosteroid,
• animal,
• union,
• protease,
• indication,
• snake,
• portion,
• country,
• phosphatase,
• ir,
• layer,
• polysaccharide,
• means,
• vehicle,
• polypeptide,
• lipid,
• outing,
• play,
• owner,
• hydrocolloid,
• development,
• event,
• tumor,
• emotion,
• neurohormone,
• isomer,
• athlete,
• therapy,
• occupation,
• contamination,
• object,
• instrumentation,
• neuroleptic,
• alloy,
• anticoagulant,
• region,
• symptom,
• macromolecule,
• engagement,
• job,
• interface,
• profession,
• filler,
• quality,
• document,
• enzyme,
• measure,
• fertilizer,
• dog,
• membrane,
• particle,
• song,
• information,
• arts,
• constituent,
• filter,
• body,
• relay,
• star,
• education,
• chemical,
• attraction,
• repeater,
• pursuit,
• action,
• allergen,
• matter,
• pathology,
• formation,
• aldehyde,
• street,
• feature,
• treatment,
• pet,
• analgesic,
• gas,
• works,
• operations,
• fun,
• atom,
• ketone,
• receptor,
• medication,
• waste,
• work,
• antidepressant,
• alkali,
• livestock,
• yeast,
• insect,
• bacteria,
• pesticide,
• file,
• surface,
• oxide,
• industry,
• polymer,
• impurity,
• radical,
• entity,
• order,
• zone,
• market,
• mechanism,
• ability,
• cation,
• salt,
• disease,
• anode,
• microorganism,
• monomer,
• peptide,
• force,
• environment,
• gadget,
• item,
• change,
• carbonate,
• antigen,
• intermediate,
• operation,
• hormone,
• coolant,
• process,
• female,
• room,
• element,
• business,
• organ,
• cytokine,
• decay,
• trap,
• behavior,
• hardware,
• game,
• solvent,
• scavenger,
• oxygen,
• alkaloid,
• tuberculosis,
• elements,
• arthritis,
• device,
• discipline,
• response,
• volatile,
• detector,
• stimulant,
• factor,
• source,
• residue,
• repository,
• procedure,
• moiety,
• antimetabolite,
• nucleotide,
• service,
• intervention,
• space,
• firewall,