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SINISTRAL TORSION:
A term denoting the situation in which the boundary between the fourth and fifth postcingular
homologues (IV/V) appears to be significantly
distal in location relative to the boundary between the third and fourth precingular homologues (4/5), as if the
hyposome has been rotated distally with regard to the
episome. Such configurations are termed
sinistrally contorted. The present use of the term sinistral is analogous to its use in structural geology in describing relative movements along faults. See also
dextral torsion and
neutral torsion. Refer to Text-Figure 83A.
DINOFLAJ (c) 1998