Statistical analysis of the quantal basis of secretory granule formation

Marika Křepelová-Dror, Ilan Hammel, Isaac Meilijson

Research output: Contribution to journalArticlepeer-review


The size distribution of vesicles exocytosed from secretory cells displays quantal nature, vesicle volume is periodic multi-modal, suggesting that these heterogeneous vesicles are aggregate sums of a variable number of homogeneous basic granules. Whether heterogeneity is a lumping-together artifact of the measurement or an inherent intra-cell feature of the vesicles is an unresolved question. Recent empirical evidence will be provided for the quantal nature of intra-cell vesicle volume, supporting the controversial paradigm of homotypic fusion: basic cytoplasmic granules fuse with each other to create heterogeneously sized vesicles. An EM-algorithm-based method is presented for the conversion of multi-modal to quantal data that provides as by-product estimates of means and variances of basic granule packaging. Microsc. Res. Tech. 77:1-10, 2014.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalMicroscopy Research and Technique
Issue number1
StatePublished - Jan 2014


  • EM algorithm
  • Multimodality
  • Stereology
  • Unit granule
  • Wicksell corpuscle problem


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