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L-Glutamine and L-arginine are classified as semi-essential or conditionally essential amino acids, which means that the human body can synthesize them under some health conditions but not others. Both are abundant in many foods.

±·±ð¾±³Ù³ó±ð°ùÌýD-glutamine nor D-arginine is common in nature, so the L-amino acids are usually referred to without prefixes. In 1883, German chemists Ernst. Schulze and E. Bosshard isolated L-glutamine from the juice of sugarbeets. It is the most common amino acid in human blood and a key component of proteins.

In 1886, Schulze was also the first to isolate L-arginine, in this case from lupin seedlings. It is also an important amino acid in protein biosynthesis.

It turns out that a difference in occurrence between these two amino acids makes a huge difference in huge animals. This year, while examining the melanocortin system* of cetaceans, Roger D. Cone at the University of Michigan (Ann Arbor) and colleagues discovered that the . Glutamine is at this position in baleen whales, whereas toothed whales and dolphins contain arginine instead.

Cone’s group found that arginine in the receptor suppresses the beasts� appetites relative to the glutamine-containing receptor. They believe that this difference contributes to the much larger sizes of baleen whales.

*The melanocortin system is an important regulator of metabolism, food intake, and fat storage.