Source:http://linkedlifedata.com/resource/umls/id/C0013852
MSH: Stable elementary particles having the smallest known negative charge, present in all elements; also called negatrons. Positively charged electrons are called positrons. The numbers, energies and arrangement of electrons around atomic nuclei determine the chemical identities of elements. Beams of electrons are called CATHODE RAYS.,NCI: A fundamental particle with a negative charge.