Single 2-μm histological section from 140 serial sections used to quantify relative abundance of intravasating large protrusions, intravasating proplatelets, free large protrusions, and free proplatelets. Single 2-μm histological section from 140 serial sections used to quantify relative abundance of intravasating large protrusions, intravasating proplatelets, free large protrusions, and free proplatelets. Bone marrow of the diaphysis region obtained from flushed femurs. Scale bar represents 100 μm. Image representative of three independent experiments. Edward Brown et al. LSA 2018;1:e201800061 © 2018 Brown et al.