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essential to clinically interpret the molecular sequence data derived from the Human Genome Project. Overall, the book offers a most welcomed framework to address the coexistence of chromosome observations and molecular biology, and their importance in genomics research. Understanding this is a pressing historiographical problem, given the dominance of molecular biologists in existing narratives and the apparent revival of chromosome research. There is yet still work to do in exploring specific overlaps between the visual and molecular approaches to the genome. A potential candidate is Victor McKusick, a main actor in de Chadarevian’s account and a co-author of the article in which Celera Genomics presented one of the draft sequences of the human genome published in 2001. Uncovering the specific circumstances in which this contribution occurred would greatly illustrate the intersections that this book highlights.