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Motazedian et al. examine human T-cell genesis in haematopoietic organoids and show that RAG1 marks multipotent T-cell progenitors that arise directly from the haemogenic endothelium.
Yahara et al. show that yolk-sac macrophages, which are derived from erythromyeloid progenitors, produce neonatal osteoclasts that support bone homeostasis and repair and also provide long-lasting osteoclasts in adult bone.