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January 15, A monthly injection of an experimental anti-retroviral drug protected female monkeys from vaginal infection by a simian form of HIV, according to two new studies. The research, which was published Wednesday in Science Translational Medicineraises hopes for the development of a long-acting pre-exposure prophylaxis, or PrEP, drug that would guard against HIV infection during both anal and vaginal intercourse, according to scientists.

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At some point in the species' history, female ruddy ducks decided blue bills were sexy, and evolution favored the flamboyant feature.

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The concentration of sialic acid was determined in the reproductive organs, pituitary gland and urine of male and female langur monkeys. In the male, sialic acid concentration was lowest in the testes and highest in the epididymides. Both caput and cauda epididymides contained almost the same concentration. Castration and subsequent androgen administration did not modify the concentration of sialic acid by comparison with intact animals, suggesting that sialic acid is not androgen-dependent in the langur.

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