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On page 398 of this article, the highlighted description for reference 12 should instead be attributed to reference 11: An elegant study in which a hypomorphic Blm allele is used to induce LOH of retrovirally inactivated tumour suppressor genes. On page 399, the highlighted description for reference 54 should instead be attributed to reference 56: These authors demonstrate that insertional mutagenesis can be used to screen for genes that confer resistance to therapeutic agents in vivo.