The chemicals form when amino acids react with creatine, a chemical found in muscles.

VOA: special.2010.06.01

Volatile markets can react suddenly in wild and unpredictable ways.

VOA: special.2011.08.12

There are two mountains in the distance. The light was changing quickly, so I had to react so quickly.

VOA: standard.2009.12.15

The the Afrikaaner Resistance Movement (AWB), which the 69-year-old farmer helped found in 1973,vowed revenge, but says it will not react violently.

VOA: standard.2010.04.05

I think the way that they might react to his presence-we'll see how that is-probably a positive reaction, should resonate in the Arab media, and that should be positive,"

VOA: standard.2009.05.09