4.2.1.70	31000	-	pseudouridine synthase I, calculation from genomic sequence	
4.2.1.70	46610	-	pus1p, calculation from sequence of cDNA	
4.2.1.70	50000	-	2 * 50000, glycerol gradient sedimentation, tRNA induced dimerization	
4.2.1.70	62100	-	Pus1p, calculation from genomic sequence	
4.2.1.70	63200	-	1 * 63200, MALDI mass spectrometry