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You may consider taking a look at the SCOP structural classification of proteins to check all beta proteins and all alpha proteins. As per specific examples and though not belonging to the SCOP classes mentioned above, Porin for a beta protein (PDB:1A0S), and Rhodopsin for an alpha protein (PDB:1F88) are two nice structures to look at.
Here a solution that does not require you to upload the files to the servers: You can graphically visualize DSSP and Stride at the Sequence Page at RCSB PDB: http://www.rcsb.org/pdb/explore/remediatedSequence.do?structureId=5P21&bionumber=1 "add annotation" -> Stride and look at the graphical comparison between DSSP and Stride.
You can find examples by using the "drilldown" function at the RCSB PDB homepage: Click on the number 103921 at the top of the page at http://www.rcsb.org then find the "SCOP Classification" section and then e.g. select "All alpha proteins".
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