Accepted Manuscript Title: Gallstone formation as an example of the two-step space confined aggregation process Author: Jacek Si ´ odmiak PII: S0303-2647(18)30352-6 DOI: https://doi.org/10.1016/j.biosystems.2018.12.003 Reference: BIO 3922 To appear in: BioSystems Received date: 15 September 2018 Revised date: 4 December 2018 Accepted date: 5 December 2018 Please cite this article as: Si´ odmiak J, Gallstone formation as an example of the two-step space confined aggregation process, BioSystems (2018), https://doi.org/10.1016/j.biosystems.2018.12.003 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.