Protein structures can be grouped based on their similarity or a common evolutionary origin. SCOP and CATH databases provide two different structural classifications of proteins.
Read more about this topic: Protein Structure
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... general formula SinH2n + 2) wherein the silicon atoms are joined in a snake-like structure branched (general formula SinH2n + 2, n > 3) wherein the silicon backbone splits off in one or more ... polycyclic) and branching structures, and they are still silanes (no general formula) as long as they are acyclic (i.e ...
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“... the structure of our public morality crashed to earth. Above its grave a tombstone read, Be toleranteven of evil. Logically the next step would be to say to our commonwealths criminals, I disagree that its all right to rob and murder, but naturally I respect your opinion. Tolerance is only complacence when it makes no distinction between right and wrong.”
—Sarah Patton Boyle, U.S. civil rights activist and author. The Desegregated Heart, part 2, ch. 2 (1962)