The sulfur cytochemistry of cnidae from the Portuguese man-of-war Physalia physalis, the scyphozoan Cassiopeia xamachana, and the black coral Cirrhipathes luetkeni was evaluated on the basis of ...
CD4, a member of the immunoglobulin superfamily of receptors that mediates cell-cell interactions in the immune system, is the primary receptor for HIV-1. The extracellular portion of CD4 is a ...
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