tokens: Initial computer based similarity searches identified human retinoblastoma binding protein 1 ( RBP - 1 ) , Drosophila melanogaster male specific lethal - 3 ( Msl - 3 ) , S . pombe altered polarity - 13 ( Alp13 ) and S . cerevisiae Eaf3p , a component of the yeast NuA4 HAT complex ( Galarneau et al . , 2000 .