Preposition: of

• dopamine: Levodopa, the metabolic precursor of dopamine, relieves the symptoms of Parkinson's disease presumably by being converted to dopamine in the brain.

• vitamin: Vitamin D, a fat-soluble vitamin, is required... into a precursor of vitamin D.

Preposition: for

• synthesis: Discuss the importance of metabolic pathways in cells for the maintenance of levels of ATP and the provision of precursors for macromolecule synthesis.

Adjective modifier

• biosynthetic: Its biosynthetic precursor, demecolcine, is an alkaloid.

• inactive: For those enzymes in which an inactive precursor is converted to the active form(s ), it is recommended that: 15.

• metabolic: Levodopa, the metabolic precursor of dopamine, relieves the symptoms of Parkinson's disease presumably by being converted to dopamine in the brain.

• immediate: St. John the Baptist is the Lord's immediate precursor or forerunner, sent to prepare his way.

• necessary: It, however, is the necessary precursor for the two week dose of shock therapy that follows.

• essential: A Data Architecture is thus an essential precursor to making maximum use of this invaluable resource.

Modifies a noun

• lesion: Their relation to squamous cell carcinoma is still subject to debate but most view them as precursor lesions.

• protein: Thyroglobulin - The precursor protein of the thyroid hormones.

• chemical: In addition to their civilian uses, chlorine and phenol are used for precursor chemicals which contribute to the production of chemical agents.

• cell: However the ray precursor cells which are formed divide normally to form fully differentiated rays.

• molecule: All CVD techniques for producing diamond films require a means of activating gas-phase carbon-containing precursor molecules.

Noun used with modifier

• oligodendrocyte: A particular interest is the population of cells called oligodendrocyte precursors.

• amine: They develop from ' apud ' ( amine precursor, uptake and decarboxylation ) cells.

• ozone: This will require action on ozone precursor emissions at a global scale.

• hormone: Depressed people interested in considering this hormone precursor should consult a doctor.

• chemical: Last month, Taiwan intercepted a North Korean vessel carrying what the United States has called a chemical weapons precursor.

• protein: Production of transgenic soybean lines expressing the bean pod mottle virus coat protein precursor gene.