$B$;$$$2$s$3$&$=!!$*$h$S!!(BDNA$B$/$_$+$($7$e$[$&$,!!$+$$$O$D$5$l!"$J$s$N(B $B$1$s$-$e$&$,!!$+$N$&$K!!$J$C$?$H!!$$$C$F$$$^$9$+!#(B
What was the research stated in the paragraph 3, that could be carried out by the development of restriction enzymes and DNA recombination methods?
2. $B@8?#:YK&$N8&5f(B
$B$;$$$7$g$/$5$$$\$&$N!!$1$s$-$e$&(B
Research of germ cells
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