<entry> <ent_seq>2859177</ent_seq> <k_ele> <keb>対照区</keb> </k_ele> <r_ele> <reb>たいしょうく</reb> </r_ele> <sense> <pos>&n;</pos> <xref>対照群</xref> <gloss>control group (in an experiment)</gloss> </sense> </entry>