.. _config_ref tasks make_membrane_system bilayer composition:

``composition``
===============

Alternate way of expressing bilayer composition; supercedes memgen-format 'lipids', 'mole_fractions', and 'lipid_conformers'

Single-valued attributes:

  * ``upper_leaflet``: List of dicts with keys 'name', 'frac', and 'conf' for each lipid species

  * ``lower_leaflet``: List of dicts with keys 'name', 'frac', and 'conf' for each lipid species



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