They contain carbon, hydrogen, oxygen and nitrogen and usually sulfur, occasionally phosphorus. Proteins form a large and essential part of the body mass, comprising especially cell membranes, connective tissue, muscles, enzymes, hormones, blood proteins. To maintain this mass the diet must contain a high proportion of protein, especially in growing animals and those recovering from debilitating diseases.
Russian composer Sergei Prokofiev wrote Peter and the Wolf in 1936 after returning to Moscow following a 19-year, self-imposed exile. It is a children's musical story that teaches about the orchestra by introducing various characters portrayed by seven themes played on either solo instruments or groups of instruments.
From April to August 2002, Ed Wynne substituted for Russo on saxophones. On October 26, 2004, the Doobie Brothers released Live at Wolf Trap, a live album that was recorded at Wolf Trap National Park for the Performing Arts in Vienna, Virginia on July 25 of that year. The live album features the final recordings of drummer and vocalist Keith Knudsen.