Chargaff was not included in the Nobel Prize because the Nobel Committee felt that his work, while important, was not groundbreaking enough to warrant the prestigious award. Chargaff's work on the base composition of DNA was undoubtedly significant, but it was not seen as revolutionary or transformative in the same way that the discoveries of Watson and Crick, who received the Nobel Prize in 1962, were.
Chargaff's research on the base composition of DNA, although foundational to the field of genetics, was not fully understood or appreciated at the time of the Nobel Prize award in 1962. Additionally, other factors such as geopolitical considerations and the prevailing scientific consensus may have influenced the decision of the Nobel Committee.