- Chemicals which were positive in in vitro mutagenicity tests in mammals and which also show a chemical-structure activity relationship to known germ cell mutagens should be considered for classification as Category 2 mutagens. - 哺乳類を用いるin vitro 変異原性試験で陽性となり、さらに既知の生殖細胞変異原性物質と化学的構造活性相関を示す化学物質は、区分2 変異原性物質として分類されるとみなすべきである。 - 経済産業省