URL：https://bio.libretexts.org/@api/deki/files/8713/OSC_Microbio_10_02_DoubHelix.jpg?revision=1&size=bestfit&width=787&height=443
掲載元：https://bio.libretexts.org/Courses/University_of_Arkansas_Little_Rock/BIOL3300_Genetics_(Leacock)/01:_Chemistry_to_Chromosomes/1.01:__The_Structure_of_DNA
