An atom or group of atoms that has acquired an electric charge through the gain or loss of an electron or electrons. An essential mineral. Virtually all of the oxygen used by cells in the life process are brought to the cells by the hemoglobin of red blood cells. Iron is a small but most vital, component of the hemoglobin in 20,000 billion red blood cells, of which 115 million are formed every minute. Essential amino acid.
Isoleucine is essential for proper growth in infants and for nitrogen balance in adults.
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