tokens: Human TR beta 1 mRNA levels in lymphocytes were 1.8 +/- 0.4 , 1.9 +/- 0.5 , 1.1 +/- 0.4 10 ( -18 ) mol/microgram RNA in hypo- , eu -and hyperthyroid patients , respectively , corresponding to an estimated 0.5 -2 molecules per cell .