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plasma items

The top image shows the ability of semen fibrils (white) to promote HIV infection by facilitating the binding of HIV (red) to cellular targets (blue). Image generated by W. Mothes, J. Luna, and P. Uchil, and used as cover image by Journal of Virology (Roan et al (2009) J Virol 83:73). The bottom image shows electron micrographs of human sperm cells in the absence (left) or presence (right) of semen fibrils. Semen fibrils, in the extracellular space surrounding the sperm cells, directly interact with the sperm membrane (arrows) and affect their activity.