Video animation on the levels of protein structure

Link to video shown in class:
http://www.youtube.com/watch?v=lijQ3a8yUYQ&list=FL-cFTJ8NxBjonnjuwSQgSsw&index=1&feature=plpp_video

Link to another video (not shown in class):
http://highered.mcgraw-hill.com/sites/0072943696/student_view0/chapter2/animation__protein_denaturation.html