_:b667746880 . _:b667746880 "ISBN:978-0471984931" . _:b667746880 . _:b667746880 "ISBN:0123195837" . _:b667746880 . _:b667746880 . _:b667746880 . _:b667746880 . _:b667746880 "Structural homology that involves complex structures from which only a fraction of the elements that can be isolated are separately homologous." .