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(a) Crystal structure of β-hematin. The molecules stack parallel to the (131) crystallographic plane. (b) Model of the β-hematin molecule corresponding to (a), showing angles 
(top), 
and 
(bottom). (c) Schematic representation of the formation of the FP dimer. The orientations of the porphyrin ring about the xy and xz planes are described by 
and 
, respectively. (d) The two-dimensional layers of the FP dimers.
