Extended Data Fig. 5: Transmission electron microscopy of cartilaginous particles of each ExpLBM cell on day 42 of step 3.
From: Induction and expansion of human PRRX1+ limb-bud-like mesenchymal cells from pluripotent stem cells

Cartilaginous particles of COL2pathy-ExpLBM cells comprise chondrocytes with a distended endoplasmic reticulum and low abundance of glycogen. Arrows and arrowheads indicate the endoplasmic reticulum (ER) and glycogen, respectively.