The monomeric units from which DNA or RNA polymers are constructed. They consist of a purine or pyrimidine base, a pentose sugar, and a phosphate group. (From King & Stansfield, A Dictionary of Genetics, 4th ed)
Nucleotide
D002395
Catecholamines
A general class of ortho-dihydroxyphenylalkylamines derived from TYROSINE.
Catecholamine,Sympathin,Sympathins
D002396
Catechols
A group of 1,2-benzenediols that contain the general formula R-C6H5O2.
The inner portion of the adrenal gland. Derived from ECTODERM, adrenal medulla consists mainly of CHROMAFFIN CELLS that produces and stores a number of NEUROTRANSMITTERS, mainly adrenaline (EPINEPHRINE) and NOREPINEPHRINE. The activity of the adrenal medulla is regulated by the SYMPATHETIC NERVOUS SYSTEM.