Explain the effect of expressing only S1 on the cells in culture 1. Describe the effect of expressing combinations of protein S and protein R on the survival of the cells in culture 2 AND culture 3.

Cancer cells spread to other parts of the body by entering the bloodstream. which of the following organs could prevent a cancer cell in the bloodstream from spreading, and why? a. the spleen, because it releases lymphocytes into the blood b. the peyer's patches, because they release lymphocytes into the blood c. the lymph nodes, because they release lymph into the blood d. the thymus, because it releases lymph into the blood