Update tutorial.md

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https://galaxyproject.github.io/training-material/topics/computational-chemistry/tutorials/md-simulation-gromacs/tutorial.html

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training-material/topics/computational-chemistry/tutorials/md-simulation-gromacs/tutorial.md

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> This guide is based on the GROMACS tutorial provided by Justin Lemkul [here](http://www.mdtutorials.com/gmx/lysozyme/index.html) - please consult it if you are interested in a more detailed, technical guide to GROMACS.

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Here, and in the later steps, two options are presented under 'Parameter input'. Firstly, the default setting, which we will use for this tutorial, requires options to be selected through the Galaxy interface. Alternatively, you can choose to upload an MDP (molecular dynamics parameters) file to define the simulation parameters. Using your own MDP file will allow greater customization, as not all parameters are implemented in Galaxy (yet); however, it requires a more advanced knowledge of GROMACS. Description of all parameters can be found [here](http://manual.gromacs.org/documentation/2018/user-guide/mdp-options.html).