(A) T-cell subset analysis. The cytokine producing cells in cord and adult blood were characterized according to expression of CD45RA and CD45RO. The results given were calculated using the ratio of CD45RA to CD45RO, when these values were expressed as a percentage of the total population analyzed. In each case the mean percentage positivity as a percentage of the total lymphoid population is noted as well as the number of samples tested (n).  (B) T-cell subset analysis. The cytokine-producing cells in cord and adult blood were further characterized according to expression of CD4 and CD8. The values given were calculated using the results expressed as a percentage of the total population analyzed, as in (A).