Update README.md

Author: pgleeson

README.md

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 # L23 Pyramidal Cell Tutorial
 
-A tutorial introducing OSB's ability to visualise, analyse and simulate multicompartmental cells.
+A tutorial introducing OSB's ability to visualise, analyse and simulate biophysically realistic, multicompartmental cells.
 
-Uses a Layer 2/3 Pyramidal cell from the Blue Brain Project as an example. 
+Uses a detailed Layer 2/3 Pyramidal cell from the [Blue Brain Project Neocortical Microcircuit model](https://bbp.epfl.ch/nmc-portal/microcircuit) as an example.