Figure 1.

Total cell number in bronchoalveolar lavage fluid of rats after intratracheal instillation of silica or saline and intraperitoneal injection of saline or ω-nitro-L-arginine methyl ester (L-NAME). QL = silica (quartz) + L-NAME; QS = silica + saline; SL = saline + L-NAME; SS = saline + saline (These abbreviations also apply to subsequent figures) (mean + se).