Figure 3. Transmission electron microscopy examination of the internal structural organization of the hEBs formed from hiPSCs (A) or BG01V/hOG hESCs (B) in the hydrogel microwells under the no-ROCK-i-treatment condition at different time points after extraction (A1, B1) freshly extracted; (A2, B2) 1 day; and (A3, B3) 7 days after extraction. (AJ, adherence junction; GJ, gap junction; D, desmosome; TJ, tight junction).