. Author manuscript; available in PMC: 2021 Oct 1.

Published in final edited form as: J Struct Biol. 2020 Jul 28;212(1):107584. doi: 10.1016/j.jsb.2020.107584

Table 1.

Fraction of β-cell volume for different stages of secretory granules obtained from slices through cellular volumes spaced 1 μm or 0.5 μm apart in SBEM image stacks.

	Cores of mature secretory granules	Cores of immature secretory granules	Cores of transforming secretory granules
Fractional volume occupied by secretory granules (mean of 6 cells)	f_mat = 0.072	f_im = 0.0026	f_tr = 0.0025
st. dev. of fractional volume occupied by secretory granule type	0.012	0.0005	0.0007
s.e.m. of fractional volume occupied by secretory granule type	0.005	0.0002	0.0003
Total number of granule type analyzed	8,120	396	397
Number block face images analyzed	50	117	117