5. Table 7 (located in . Blood sampling strategy for: pharmacodynamic studies which will measure the lymphocyte subsetsas well as dendritic cells types 1 and 2 are shown in the following table (table 8). Concentration of rATG will also be measured in 0.1 ml human plasma obtained from the same blood sample. Concentration associated with half-maximal depletion of each subset will be determined by pharmacodynamic models based on Hill equations.