These results suggest that selection has influenced the nucleotide composition to maintain a high frequency of alanine and lysine.
Many sequence classes peaked in frequency at different rounds of selection, but in this case, one class appeared to consistently maintain a high frequency.
Further, we show that selection has acted to maintain a high frequency of functionally relevant acidic amino acids in the region that interrupts TPR2.
This subtype is observed predominantly in children under 10 in unirradiated populations, but maintains a high frequency in those aged 10 15 from those areas exposed to fallout from the Chernobyl accident.
Among the characteristics of a filter bank to be used in subband audio coding, it is desirable that the filter bank and its inverting process maintain a high-frequency selectivity.
Presumably the most common form of α-thalassemia, --SEA, is matntained at a high frequency through heterozygote advantage by malarial selection.
Murine CMV (MCMV) infection induces effector CD8+ T cells that continue to increase in frequency after acute infection ("inflation") and are stably maintained at a high frequency, with up to 20% of the CD8+ T-cell compartment being specific for one epitope, although the flexibility and turnover of these populations is not fully defined.
Through experimentation, we selected the outlined design as the variable parallelism is compensated for by the ability to maintain a high clock frequency.
Multiplexers are added between every two registers to correct the imbalance, hence to reduce the deviation of duty cycle and magnitude among multi-phase clocks while maintaining a high operating frequency and low power consumption.
To overcome these limitations, we utilized populations of non-alloreactive [33] human umbilical cord derived mesenchymal progenitors (HUCPVCs) [10], [34], harvested from a total of 57 cords, that maintain a high clonogenic frequency in vitro to isolate definitive SCD clones.
