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Effect of Secretory Leucoproteinase Inhibitor (SLPI) on pIgR/SC production. Confluent Calu-3 monolayers were cultured with increasing numbers of neutrophils (0.6 × 106 to 10 × 106 cells) in the presence (dashed line) or in the absence (full line) of SLPI. After 48 hrs, SC production was measured in supernatants (black lines) and in cell lysates (grey lines). Data are means ± SD of one experiment (out of 2) in triplicates. *P ≤ .05 as compared with control.
