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• W2007411036 abstract "The fertilized ascidian egg is thought to be comprised of distinct regions of tissue-specific cytoplasmic determinants. This idea was tested by bisecting fertilized eggs into egg fragments and culturing them until the unoperated controls developed into larvae. Fertilized eggs were bisected using a microsurgical method in which part of the uncleaved zygote was extruded through a hole made in the follicular envelope and the cytoplasmic bridge between the two egg regions was severed. One egg fragment contained all of the egg myoplasm (termed myoplasm-enriched or ME fragment), while the other fragment lacked myoplasm. ME fragments consisting of 40–50% of the total egg volume in many cases cleaved normally and developed into larvae. In a few cases, ME larvae initiated metamorphosis and developed into normal juveniles. Triton-extraction of ME embryos and larvae showed that the myoplasm was redistributed into nonmuscle lineage cells at each stage of development. Despite the redistribution of myoplasm into many of the endoderm cells situated in the head region of ME larvae, the expression of the muscle-specific enzyme acetylcholinesterase (AchE) and a muscle-specific antigen (Mu-2) was restricted to the tail muscle cells. The endoderm cells situated in the head region of ME larvae expressed an endoderm-specific enzyme alkaline phosphatase (AP) as in the controls. Furthermore, cleavage-arrested four- and eight-cell ME embryos expressed AchE activity in the expected number of blastomeres. When a greater quantity of myoplasm was redistributed into cells that normally do not express AchE activity by producing 10–30% ME embryos, in a few cases more than the expected number of blastomeres expressed AchE activity. In conclusion, the main finding of the present investigation, based on the development of ME fragments comprising 40–50% of the total egg volume, is that ascidian embryos are capable of regulative development." @default.
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• W2007411036 title "Development of myoplasm-enriched ascidian embryos" @default.
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• W2007411036 doi "https://doi.org/10.1016/0012-1606(88)90178-9" @default.
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