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. 2021 Jan 6;9(1):coaa115. doi: 10.1093/conphys/coaa115

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© The Author(s) 2021. Published by Oxford University Press and the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Progesterone Z-score by age of selected individual bearded (top) and ringed (bottom) seals. The oldest age of each animal corresponds to P, or the proximal claw band (closest to the body of the seal) and is the last point in each graph. The second to last point in these graphs is D, the band laid down in the season before the seal was harvested. A. An implanted (IM) bearded seal, B. a post-partum (PP) bearded seal, C. a primiparous, post-partum (PPP) bearded seal, D. a post-partum (PP) bearded seal, E. an implanted (IM) ringed seal, F. a primiparous, unimplanted (PUM; i.e. embryonic diapause) ringed seal, G. a non-pregnant (NP) ringed seal and H. an anovulatory (AO) ringed seal.