An enhanced GFP (eGFP) gene was
modified via polymerase chain reaction (PCR) to remove the
translational stop signal and to allow cloning of the eGFP gene in
translational register with the nuclear translocation domain (this
addition was made to the 39 end of eGFP). The Xenopus Ef1-a
enhancer/promoter regulatory sequence (Johnson and Krieg, 1994)
was introduced into the BglII site of this vector 59 of the eGFP gene.
The DNA constructs used for the formation of DNA-injection
transgenics used the pW1 vector (Balkan et al., 1992a,b) that has a