White blood cells are produced in the bone marrow. They are released into the bloodstream and travel wherever they are needed. Low levels of neutrophils occur when the bone marrow cannot replace them as fast as needed. In babies, the most common cause is infection. A very severe infection may cause neutrophils to be used up quickly. It may also prevent the bone marrow from producing more neutrophils. Sometimes, an infant who is not sick will have a low neutrophil count for no obvious reason.
The Mikoyan MiG-29 (Russian: Ð¼Ð¸ÐºÐ¾ÑÐ½ Ð¼Ð¸Ð³-29; NATO reporting name: Fulcrum) is a fourth-generation jet fighter aircraft designed in the Soviet Union.
The Mikoyan-Gurevich MiG-21 (Russian: Ð¼Ð¸ÐºÐ¾ÑÐ½ Ð¸ Ð³ÑÑÐµÐ²Ð¸Ñ Ð¼Ð¸Ð³-21; NATO reporting name: Fishbed) is a supersonic jet fighter aircraft, designed by the Mikoyan-Gurevich Design Bureau in the Soviet Union.he MiG-21 was also used extensively in the Middle East conflicts of the 1960s, 1970s and 1980s by Egyptian Air Force, Syrian Air Force and Iraqi Air Force. The MiG-21 first encountered Israeli Mirage III Cs on 14 November 1964, but it was not until 14 July 1966 that the first MiG-21 was shot down.