Image of the Month 2017
Erythroid niches are specialized bone marrow niches for erythroid cells. Despite their discovery in the 1950s, little is known about the morphology of these erythroblastic islands. This scanning electron micrograph reveals pilus like structures between the developing erythroid cells and other microstructures that have not previously been described.
Transmission electron micrograph of a cross section of a sperm flagellum showing the characteristic “9 + 2” arrangement of microtubules in the axoneme. Nine fused microtubule doublets form a ring surrounding two single microtubules at the centre. Nine mitochondria can be seen to surround the periphery of the axoneme, one for each microtubule doublet.