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Deuterostome phylogeny reveals monophyletic chordates and the new phylum Xenoturbellida
TLDR
To study the relationships among all deuterostome groups, an alignment of more than 35,000 homologous amino acids is assembled, including new data from a hemichordate, starfish and Xenoturbella and it is concluded that chordates are monophyletic.
Hormonal regulation of the humoral innate immune response in Drosophila melanogaster
TLDR
It is shown that JH and 20E have antagonistic effects on the induction of antimicrobial peptide genes in Drosophila melanogaster, suggesting that 20E and JH play major roles in the regulation of gene expression in response to immune challenge.
What is metamorphosis?
TLDR
This article is presented as an introduction to this symposium volume, but also as a reference tool that can be used by others interested in metamorphosis, to represent a springboard for further investigations into the surprisingly deep mechanistic similarities among independently evolved life cycle transitions across kingdoms.
Mechanisms of Life History Evolution: The Genetics and Physiology of Life History Traits and Trade-Offs
TLDR
This chapter discussesMechanisms into life history evolution, growth, development, and maturity, and the role of technology in development and trade-offs.
Reduction in morphological plasticity in echinoid larvae: relationship of plasticity with maternal investment and food availability
TLDR
Comparisons among species showed that larvae developing from smaller eggs had a significantly higher plastic response to exogenous food than larvae developingFrom large eggs, and species with larger eggs will have reduced overall plasticity and growth trajectories similar to highly fed larvae from a species that exhibits plasticity.
Cross-kingdom hormonal signaling: an insight from thyroid hormone functions in marine larvae
TLDR
It is suggested that exogenous sources of TH may have been ancestral, while the ability to synthesize TH endogenously may have evolved independently in a variety of metazoans, resulting in a diversity of signaling pathways and, possibly, morphological structures involved in TH-signaling.
Signaling mechanisms underlying metamorphic transitions in animals.
TLDR
It is concluded that all metamorphoses share at least 4 components: the differentiation of juvenile/adult structures, the degeneration of larval structures, metamorphic competence, and change in habitat.
Thyroid hormone metabolism and peroxidase function in two non-chordate animals.
TLDR
Evidence is provided for endogenous TH synthesis in the sea hare Aplysia californica and the sea urchin Lytechinus variegatus based on thin layer chromatography and two new peroxidase genes are identified showing high sequence similarity with peroxidasin and thyroidperoxidases.
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