Preprocessing included slice timing for correcting differences in the timing of acquisition between slices, realignment of functional time series for correcting head motion, coregistration of functional and anatomical data, segmentation for extracting grey matter, spatial normalization to the Montreal Neurological Institute MNII) space, and spatial smoothing (Gaussian kernel, 6 mm FWHM).
This method is sensitive to the timing of acquisition and resale.
Figure 5 shows the approximate timing of acquisition and loss of glycosylation sequons in HA1 sequences, comparing against the dominant charge states of group 1 and 2 amino acids.
The timing of acquisition also needs careful planning.
We used the midpoint between the last negative and the first positive HIV PCR test results to estimate timing of acquisition of postnatal infection.
Examination of additional wild strains from ongoing resequencing efforts (S. Baker, K. McCluskey, I. Grigoriev, J. Stajich, and unpublished data) provided a better understanding of the origins and timing of acquisition of this newly described selfish genetic element.
We took advantage of the recent production of genomic scale data from sponges and cnidarians, sister groups from eumetazoans and bilaterians, respectively, to date the emergence of human proteins and to infer the timing of acquisition of novel traits through metazoan evolution.
A limitation of this cross-sectional study is that we were not able to determine the timing of acquisition of VRE in the patients identified as being colonised; therefore, patients may have acquired VRE in the remote past, with antibiotic use merely amplifying existing colonisation.
Additional comparative genomic data will help winnow in on the timing of these acquisitions and, hopefully, show whether they reflect an extreme case of differential loss of ancestral sequences or acquisitions of foreign DNA.
