Occurrence of soluble fibrin (SF) in mice injected i.v. with 0.9% NaCl. The percent of mice, that became positive for soluble fibrin in the SF agglutination test after slow i.v. injection of physiological NaCl-solution (clinical grade), is plotted versus non-injected mice ("No Rx") and versus Lipopolysaccharide (LPS)-injected mice as a positive control. Black: percent positive, shaded: percent borderline, white: percent negative for SF.