Determination of genotoxic potencies of pyrrolizidine alkaloids in HepaRG cells using the γH2AX Assay - Louisse, J; Rijkers, D; Stoopen, G; Holleboom, W J; Delagrange, M; Molthof, E; Mulder, P PJ; Hoogenboom, R LAP; Audebert, M; Peijnenburg, A ACM (Food Chem Toxicol, 2019)