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The expression of blood group antigens varies across human populations and geographical regions due to natural selection and the influence of environment factors and disease. The red cell membrane is host to numerous surface antigens which are able to influence susceptibility to disease, by acting as receptors for pathogens, or by influencing the immune response. Investigations have shown that Human Immunodeficiency Virus (HIV) can bind and gain entry into erythrocytes, and therefore it is hypothesized that blood gr

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Futon Mattress Double A double futon mattress is a type of mattress that can be used as an additional sleeping space as well as a sofa cushion. They come in sizes such as full queen, twin, and king. These beds have a more firm surface that can help ease back pain. This is particularly beneficial for pregnant women who are struggling with back pain. Firmness A futon mattress double is a light bed that doubles as an ottoman. Futon mattresses usually have a cotton or polyester cover and a filling that is flexible enough to fold up into a sofa position.