http://en.wikipedia.org/wiki/Umami
^ Agostini C, Carratu B, Riva E, Sanzini E (August 2000). "Free amino acid content in standard infant formulas: comparison with human milk". Journal of the American College of Nutrition 19 (4): 434438. PMID 10963461 .
“umami” describes a taste, but the concern is with the chemical properties and effects of MSG on humans, which others have cited as harmful.
“...the term umami was recognized as the scientific term to describe the taste of glutamates and nucleotides at the first Umami International Symposium in Hawaii.[7] Umami represents the taste of the amino acid L-glutamate and 5-ribonucleotides such as guanosine monophosphate (GMP) and inosine monophosphate (IMP).[8]”
http://en.wikipedia.org/wiki/Umami