Histidine is one of the amino acids making up proteins.
I made the image above using PyMOL, a molecular visualisation software used by scientists in the labs to see protein structures. Beautiful, right?
You can download PyMOL for educational use free of charge.
I got the file for histidine here.
How to use PyMOL? You can follow a few links here:
http://ihome.cuhk.edu.hk/~b102142/pymol/pymol_tutorial.html
http://people.mbi.ucla.edu/sawaya/tutorials/Graphics/pymol.html
http://www.bio.ph.ic.ac.uk/~scurry/Tips.html
http://www.bi.up.ac.za/homolcourse2005/Exercises/arv_pymol_tut.pdf (opens in Adobe Reader)
http://novacripta.cbm.uam.es/bioweb/soft/pymol_tutorial.pdf (opens in Adobe Reader)
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