The channel contains characteristic constrictions which include a kink near the retinal binding residue, Lys296, where the conformation of the lysine side chain determines the channel clearance (see below).
Kim et al. find that the central constriction contains three key amino-acid residues, two of which are involved in the process of anion transport, whereas the other is important for anion selectivity.
The crescent-shaped tragus (a projection on the inner side of the outer ear) is about half as long as the ear and contains a slight constriction on the back side of its base.
Since in humans synaptic blockade of outer retinal photoreceptors is not feasible, it cannot be totally excluded that the response of the steady-state pupillary constriction contains some contribution of rods and cones.
Here, we exploited this native satellite-free centromere to determine the precise localization of its functional domains in five individuals: We hybridized DNA purified from chromatin immunoprecipitated with an anti CENP-A antibody to a high resolution array (ChIP-on-chip) of the region containing the primary constriction of horse chromosome 11.
On the other hand, it is a challenge to argue that, under these conditions, almost all cells could possess chromosomes with cytologically normal primary constrictions [46], given that the centromere regions of human chromosomes contain megabases of DNA.
Catalysts prepared on carbon fibers, containing pores with small constrictions (5 Å) yielded significantly higher rates of hydrogenation of 1-hexene compared to those of cyclohexene and selectively produced cyclohexanone from cyclohexanol.
A slightly different situation is found in DrAqp8aa, -8ab and -8b, which despite having the conserved P1-P5 residues of the aquaporin subfamily, contain His instead of Phe, and Val or Ile instead of His, in the ar/R constriction.
The dilated tubes contain incomplete plicae or folds, producing its convoluted appearance, either seen as the waist sign causing focal constriction of the tubular structure [47, 48].
And here is a constriction of the second bundle, resulting in a biconditional interpretation, in which a red box contained pencils, and those boxes that are not red do not contain pencils.
