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Subj:     LOGIC PROB. - Alien Mutation (S488c) 
          From: QBrute on 5/27/2006
Source: http://www.angelfire.com/empire/qbrute/puzzles.htm
ALIEN MUTATIONS. Shown right are 12 mutation chambers labelled A-L. Each of the four aliens on the left passes through the three chambers directly to the right to finish as the alien on the right (e.g. the alien to the left of A passes through A, B, C to finish as the one to the right of C). Also, each of the three aliens at the top passes through the four chambers directly below to finish as the alien at the bottom. 

Every chamber performs a mutation and does so on one part of the body (e.g. makes head square). What does each of the 12 chambers do?