AF525447 4843 1 589 histidine tag AF525447 4843 660 677 thrombin AF525447 4843 684 716 multiple cloning site; MCS AF525447 4843 1662 1667 SV40 early signal AF525447 4843 1691 1696 SV40 early signal AF525447 4843 1759 2214 f1 AF525447 4843 2276 2281 SV40 early AF525447 4843 2388 2459 tandem repeat AF525447 4843 2460 2531 tandem repeat AF525447 4843 2555 2690 SV40 AF525447 4843 2611 2617 SV40 early promoter element AF525447 4843 3769 3774 herpes simplex virus (HSV) thymidine kinase signal AF525447 4843 3782 3787 herpes simplex virus (HSV) thymidine kinase signal