In this paper, a disturbance estimation approach is exploited within an OMBRE framework (DEOMBRE) in order to achieve a statistically satisfactory estimation of the model parameters, thus avoiding (or reducing) constraint violations even in the presence of systematic modelling errors.
Under this scenario, dispersed functional elements could reduce constraint on an existing complex domain, fostering the acquisition of new functions for that domain.
This finding might potentially be attributable either to positive selection or to a reduced constraint level on these genes.
Some Lhx proteins show long branch lengths on phylogenetic trees, suggesting that these subfamily members may be experiencing reduced constraint and/or positive selection.
In principle, a major reason for a change in rate associated with a particular phenotype is an altered selective regime occurring under that phenotype, such as positive selection or reduced constraint.
It has been postulated that gene duplications safeguard against deleterious mutations [ 28], and allow more rapid rates of evolution within coding sequences [ 29], as one gene copy retains gene function whilst the other has reduced constraint to accrue new mutations.
Clusters are good in any field because they boost productivity and innovation, and cluster policy seeks to reduce constraints and encourage externalities to raise the productivity of competition.There is limited experience in policy toward clusters, which sit in between policies aimed at the general business environment and policies targeted at creating incentives for individual firms.
Hansen (2003) suggested gene duplication as a way of reducing constraints imposed by pleiotropic interactions.
According to rule ((mathtt{R}_0))reduction of (P) amounts to independently reducing constraints (D,mathtt{I}) and (C,a).
The treatment of reducing constraints due to the existence of superclasses is standard; see, e.g., [3, 7, 10].
