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Producing enough material for screening microarrays and DNA chips is difficult (sporozoites) and essentially impossible (hepatic stage) without the use of currently unstandardized amplification techniques. Sci.

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Sildenafil, the clinical name for Viagra, has been successful in treating patients with pulmonary hypertension, according to a study published in Circulation, the Journal of the American Heart Association. Around 250,000 people in the UK suffer from pulmonary hypertension, which causes high blood pressure in the arteries of the lungs. It can be caused by heart or lung conditions such as emphysema and bronchitis and in some people is caused by lack of oxygen to the lungs (hypoxia). The condition can be severely disabling, limiting people's ability to exercise or walk even short distances and can cause early death.

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