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A reference was left out of the References Cited section of this paper. The reference is:

Bengtson, S., Cunningham, J.A., Donoghue, P.C.J., Huldtgren, T., and Yin, C., 2010, A critical view of “animal embryos” in the Ediacaran Doushantuo biota: Geological Society of America Abstracts with Programs, v. 42, no. 5, p. 409.