Peptide sequence: SSSKSKSRTS PYPQYSGFHT ERSESDHDSQ WGGSPLTDTA SPQLLDPADR Sequence homology: Cow: 93%; Dog: 100%; Guinea Pig: 93%; Horse: 100%; Human: 100%; Mouse: 100%; Pig: 100%; Rabbit: 100%; Rat: 100%. SIM1 and SIM2 genes are Drosophila single-minded