Where pigment was present within the cells (sarcoma), the attraction-spheres were represented by quite clear unpigmented areas, sometimes with a centrosome in their midst.
Trambusti, curiously, finds confirmatory evidence of this in the division of cells in sarcoma.
The sarcomatous development may even completely outgrow the epithelial elements and so form and continue to grow as a pure sarcoma.
Budding of Rous sarcoma virus and vesicular stomatitis virus from localized lipid regions in the plasma membrane of chicken embryo fibroblasts.
Kaposi's sarcoma associated herpesvirus (KSHV) encodes a cyclin homologous to cellular D-type cyclins, which predominantly activates cdk6.