Precursor ion scanning refers to monitoring for a specific loss from the precursor ion. PFOA can form as a breakdown product from a variety of precursor molecules. Prolactin also stimulates proliferation of oligodendrocyte precursor cells. The immediate precursor is 1-aminocyclopropane-1-carboxylic acid. Both routes suggested dihydroartemisinic acid as the final precursor to artemisinin. Safrole is a versatile precursor to many compounds. Numerous synthetic routes exist for the production of the DV-acid ester precursor. POIS could be caused by a defect in neurosteroid precursor synthesis. Cleavage of the NS2B3 precursor activates the protease complex. It is mainly used as a precursor to polymers. Silane is of practical interest as a precursor to elemental silicon. It is a precursor of cysteine. Aluminum metal was deposited using an aluminum dihydride precursor and AlCl. Reticuline is known as the immediate precursor of protoberberine alkaloids in plants. MgCl is the main precursor to metallic magnesium.