(Hebrew) Of the beginning; the first book of the Bible Genesies, Genesiss, Genessa, Genisa, Genisia, Genisis, Gennesis, Gennesiss
combining form denoting origin or development. Example: spermatogenesis (development of spermatozoa).
(5-hydroxytryptamine) n. a compound widely distributed in the tissues, particularly in the blood platelets, intestinal wall, and central nervous system. Serotonin is thought to play a role in inflammation similar to that of *histamine and it is involved in the genesis of a migrainous headache. Drugs that act like serotonin are used in the treatment of migraine (see 5HT1 agonist). It also acts as a *neurotransmitter, and its levels in the brain are believed to have an important influence on mood. Drugs that prolong its effects are used as antidepressants (see SNRI; SSRI).... serotonin