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Fig. 3 High-resolution visualization of UBSEs. (a) Projection image of the collected UBSEs. (b–d) are axial slices of the levels marked by the green dotted lines in (a). (e–h) are magnified images of the regions in the red boxes shown in (c) and (d), respectively. Two types of UBSEs were identified. Type one had an irregularly shape IP, as shown in (b), (e), (f), and (g). Type two was full of IP, with no cavity was found inside the UBSE, as shown in (h). Some UBSEs had HM inside their shells (orange arrowheads), as shown in (e) and (f), while others did not (green arrowheads), as shown in (b), (g), and (h). (i) 3D visualization of the UBSEs. (j) and (k) are magnified images of the regions in the red boxes shown in (i). The 3D visualization clearly displayed the entire structure of type one-UBSEs (green) and type two-UBSEs (blue).