Correlation between the degree of CD3⁺ donor chimerism and MPA Css. Data from the day-7 and day-21 MPA Css evaluation and day 28, 56, 84 chimerism analyses are shown (6 recipients of bone marrow were excluded). The twice-daily MMF group is represented by squares and the 3-times-daily MMF group by circles. (A) Total MPA Css, 79 patients (P = .04). (B) Unbound MPA Css, 70 patients (P = .02).