(in which m represents an integer of 1 to 3; and R8 and R9 independently represent hydrogen or lower alkyl), or ##STR51## (in which Y represents a single bond, oxygen, or N--R10 in which R10 represents hydrogen or lower alkyl; and n1 and n2 independently represent an integer of 1...
FIG. 35 shows the results of Southern analysis of a DT40 hybrid cell that carries a pSF1(G+n1) vector introduced into 14NΔqHAC. FIG. 36 shows the results of Southern analysis of a CHO hybrid cell into which the 14NΔqHAC vector has been introduced. FIG. 37 shows the results of ...