Toward More Useful In Vitro Toxicity Data with Measured Free Concentrations Heringa, Minne B. ; Schreurs, Richard H. M. M. ; Busser, Frans ; Van Der Saag, Paul T. ; Van Der Burg, Bart ; Hermens, Joop L. M. Abstract Publication: Environmental Science and Technology Pub Date: December 2004 DOI: 10.1021/es049285w Bibcode: 2004EnST...38.6263H