This article explores the molecularisation of medicine thesis by investigating reports on genetics and molecular medicine in the New England Journal of Medicine. While there has indeed been a large increase in the number of references to molecules in the context of genetics over the last few decades these are mostly embedded in a framework of explanatory metaphors, namely (gene) expressivity, penetrance, regulation and pathways. As most of these metaphors are drawn from the social world it would appear that the molecularisation thesis – that social life is becoming dominated by the molecular – needs to be tempered by the ways in which understanding of that molecular world is itself a reflection of social life.