title: Four layer discontinuous gradient for HIV.
authors.forename: K
authors.initials: K
authors.lastname: Kakimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Ando
authors.forename: A
authors.initials: A
authors.lastname: Yoshioka
mesh_terms: D002499:Centrifugation, Density Gradient / Q000379:methods*; D006678:HIV / Q000302:isolation & purification*; D006801:Humans; D007315:Insemination, Artificial / Q000379:methods; D008297:Male; D013094:Spermatozoa / Q000821:virology*; D020858:Tissue and Organ Harvesting / Q000379:methods