The first known attempt at a taxonomy for EPAs was originally made by Mills (2003), who proposed a classification system for EPAs that included a "list of ancestral problems and subsequent putative mechanisms".
Planned probes included direct questionning about previously identified common attributions for mental illness in Ethiopia (Alem et al. 1999), namely evil eye, bewitchment, ancestral troubles, spiritual problems and mental ('nervous') problems in the perinatal period, with follow-up questions aiming to elicit specific examples known to the participant.
We call this problem ancestral gene length reconstruction.
Many of these models can be modified to deal with the ancestral gene content problem.
> -wrap-foot> These results show the potential benefit of using the SOPH approach to the ancestral network reconstruction problem, especially in the typical situation where the error rates of measured present-day interactions can be very high (Stumpf et al., 2007).
Once the Timbisha had regained a parcel of their ancestral home, new problems arose.
The massive diversification of life and its continual change is the result of small, imperfect mutations and changes at the scale of molecules that improved on ancestral solutions to problems.
This perspective predicts that optimal cognitive performance might sometimes be induced by ancestrally-based problems, those present in ancestral environments, rather than by adaptive problems faced more commonly in modern environments.
Conceptually, this is akin to the problem of ancestral sequence reconstruction for DNA substitution models (Pupko et al., 2000), but in the context of methylation, we also have observed data on internal nodes of the tree.
Green algal and glaucophyte representatives cannot provide phylogenetic evidence for their inclusion into the ancestral lineage A. The problem is that algal and glaucophyte representatives are highly divergent, therefore their position is at the base of the tree.
