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. 2021 Nov 18;138(20):1917–1927. doi: 10.1182/blood.2020010568

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© 2021 by The American Society of Hematology

This article is made available via the PMC Open Access Subset for unrestricted reuse and analyses in any form or by any means with acknowledgment of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Figure 1. — Structure of the 21 morphological classes of BM cells used in this study. (A) Ordering of the classes into hematopoietic lineages. In agreement with routine practice, major physiological classes of myelopoiesis and lymphopoiesis are included, as well as characteristic pathological classes and classes for artefacts and unclear objects. As detailed in the main text, all cells were stained using the May-Grünwald-Giemsa/Pappenheim stain, and imaged at ×40 magnification. (B) Distribution of the 171 374 nonoverlapping images of our data set into the classes used.