1. An endoscopic survey was done in Linxian, Henan Province, Northern China on 527 people in May 1980 and histological evidence of oesophageal lesions was obtained. 2. Blood samples were collected from 58 men and 53 women aged 22-71 yr. Measurements of riboflavin, vitamin A and zinc status were
Retinitis Pigmentosa (RP) is a group of diseases in which one of a large number of mutations causes death of rod photoreceptors. After rods die, cone photoreceptors slowly degenerate in a characteristic pattern. The mechanism of rod cell death varies depending upon the gene that is mutated and the
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