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. 2001 May 22;98(11):5955–5956. doi: 10.1073/pnas.121190498

Figure 1.

Figure 1

Total number of genera as a function of time during the Phanerozoic, in the classic database of Sepkoski (2, 3). The two dark blue regions indicate the time intervals studied in the new work by Alroy et al. (1).