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+{{tag>structure}}
+====== Class =======
+This is the highest level of classification and is derived from the gross secondary structure
+content. There are 4 classes defined in the CATH classification.
+  -  Mainly Alpha
+  -  Mainly Beta
+  -  Alpha Beta
+  -  Few Secondary Structures.
+The classification of protein domains into these 4 classes has been achieved for 90% of
+structures automatically, using an automated class assignment protocol. This classification protocol includes a number of criteria:
+  * Percentage composition of secondary structures
+  * Percentage of secondary structures contacts
+  * Secondary structure alternation
+  * Percentage of parallel strands
+This is discussed in detail in the paper referenced below.
+===== References =====
+{{pubmed>long:8831787}}

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