Exact(19)
The next step is for the algorithm to try to construct viable sequences of consecutive station-to-station identities.
The most concerning finding was from the "high-efficiency particulate arrestance" (HEPA) air filter used in the ISS: 99.65% of the viable sequences they retrieved came from Actinobacteria, which, at most, accounted for only 25.25% of the viable sequences found in the JPL clean room vacuum bags.
When the reference lists included two or more in-segment stops the algorithm typically failed to find viable sequences and returned few segment identities, and a different termination criterion would likely be necessary.
In other words, at large distances d, most of the viable sequences arise through compensatory mutations.
These are given by 1 - w(d), the number of non-viable sequences at distance d, multiplied by the probability with which these non-viables turn into viable sequences after a single mutation, xcomp(d).
If no such series of mutations exists, then the two viable sequences belong to different neutral networks.
Similar(41)
Recently, much progress has been made on the fundamental sciences required to make SBS a viable sequencing technology.
Church notes that in order for the approach to become a viable sequencing technology, it must be scaled up to work on thousands of DNA strands in parallel.
By at the same time increasing the number of neutral changes and the number of different phenotypes a population can reach, mutational corridors without an effect on the phenotype make it significantly more likely that a random mutation will find a viable sequence.
We suggest that the virus species analysed in this study come from lineages that have explored a large proportion of the viable sequence space [17], and although mutation continues within each species, it is largely a reiteration of earlier exploration.
Since we study a neutral model, so that the fitness of a viable sequence is ℱ = 1 (in arbitrary units) and ℱ = 0 otherwise, the fitness difference Δℱ(A[ n] → A[ n']) can only take the values 0 if A[ n'] is a viable sequence as well, and 1 if A[ n'] is not a viable sequence.
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