_:b667747890 . _:b667747890 "ISBN:0123195837" . _:b667747890 . _:b667747890 . _:b667747890 "ISBN:978-0471984931" . _:b667747890 . _:b667747890 . _:b667747890 "Structural homology that involves complex structures from which only a fraction of the elements that can be isolated are separately homologous." . _:b667747890 .