Type-C virus particles in placenta of the cottontop marmoset (Saguinus oedipus).

Electron microscopy of near-term placentas of two cottontop marmosets (Saguinus oedipus) revealed, in one placenta, the presence of budding and mature C-type virus particles associated with the basal trophoblast. The particles were morphologically similar to those observed by other investigators in placentas of other primate species.