0 a small child, especially one who behaves badly and is dirty or untidily dressed -- （尤指肮脏淘气的）小孩
a street urchin 街头顽童
Localization and possible role of molecules acetylcholinesterase in sea urchin embryos.
Characteristics of individual repetitive sequence families in the sea urchin genome studied with cloned repeats.
For example, in sea urchin oocytes, calciuminduced cortical granule exocytosis leads to the formation of a zygote with a mosaic plasma membrane.
The sea urchin egg is a model for such studies.
Changing localizations of site-specific surface antiperhaps sequential patterns of gene expression during gens during sea urchin spermiogenesis.
Localisation of fluorescently labelled calmodulin in living sea urchin eggs during early development.
In animal systems, studies on the activation of sea urchin and clam eggs have also found changes in enzyme activity and location.
Proteolysis of the major yolk glycoproteins is regulated by acidification of the yolk platelets in sea urchin embryos.
