The analysis of the same 2 species was subsequently refined by Cutter and Ward [ 24] using a larger dataset of 7,281 genes and a larger source of developmental expression data [ 27, 28].
Molenaar et al. referred to epigenetic influences as a "third source of developmental differences" that can account for phenotypic variation in development, in addition to genetic and environmental factors.
Therefore, we are confident in asserting that based on our evidence, hand rearing, at least when following our procedures, was not a major source of developmental stress and did not result in pathological changes in the basal ganglia circuits involved in behavioural inhibition and interval timing.
The notochord is a source of important embryonic developmental signals [ 1], with a role in coordinating the development of the notochord, central nervous system (CNS) and mesoderm.
The idea, that there may not be an isolable causal source of developmental dyslexia, may not even be as strange as it appears.
Thus microCT offers a source of quantitative data for modeling of developmental and evolutionary changes, and microCT imaging is already being applied to quantitative studies of variation [ 20] and of development [ 21].
Gene duplication can be a source of innovation for the increased developmental complexity of plants.
Hemerocallis provides another, possibly richer, source of developmental novelty to explore.
One proposed source of developmental change is changes in attention control, the ability to flexibly disengage and shift attention in a visual scene.
For example, rhizosphere conditions such as water and nutrient availability affect shoot and root architecture [2 6]; this implicates the root as a source of signals that can override endogenous developmental programs.
