Transport of a vesicle from the plasma membrane to the endosome.

The breakdown into simpler components of phenylalanine, 2-amino-3-phenylpropanoic acid.

The chemical reactions involving ethanolamine (2-aminoethanol), an important water-soluble base of phospholipid (phosphatidylethanolamine).

The breakdown into simpler components of acetylcholine, the acetic acid ester of the organic base choline.

The chemical reactions involving melanins, pigments largely of animal origin. High molecular weight polymers of indole quinone, they are irregular polymeric structures and are divided into three groups: allomelanins in the plant kingdom and eumelanins and phaeomelanins in the animal kingdom.

The formation of melanin from simpler components, including tyrosine.

The chemical reactions involving any of a group of physiologically important biogenic amines that possess a catechol (3,4-dihydroxyphenyl) nucleus and are derivatives of 3,4-dihydroxyphenylethylamine.

The formation of dopamine (3,4-dihydroxyphenylethylamine) from L-tyrosine, via the metabolic precursor 3,4-dihydroxy-L-phenylalanine (L-dopa). Dopamine is a catecholamine neurotransmitter and a metabolic precursor of norepinephrine and epinephrine.

The chemical reactions involving indolalkylamines, indole or indole derivatives containing a primary, secondary, or tertiary amine group.

The formation from tryptophan of serotonin (5-hydroxytryptamine), a monoamine neurotransmitter occurring in the peripheral and central nervous systems, also having hormonal properties.

The formation from simpler components of octopamine, 1-(p-hydroxyphenyl)-2-aminoethanol. The D enantiomer is about one-tenth as active as norepihephrine and is found in the salivary glands of Octopus and Eledone species.

The directed movement of substances from one Golgi cisterna to another, mediated by small transport vesicles.

The chemical reactions involving tyrosine, an aromatic amino acid, 2-amino-3-(4-hydroxyphenyl)propanoic acid.

A process required for sperm to reach fertilization competence. Sperm undergo an incompletely understood series of morphological and molecular maturational processes, termed capacitation, involving, among other processes, protein tyrosine phosphorylation and increased intracellular calcium.