منابع مشابه
Twin Xenopus laevis embryos appearing from flattened eggs
Remarkable progress has recently been made in molecular biology of double axis formation in Xenopus laevis. Leaving aside, for the time being, the problem of the gene expressions regulating Xenopus laevis development, here I show that pulse treatment could induce formation of a secondary axis in a fertilized Xenopus laevis egg. At 3 min after insemination, metal oxides were added to Xenopus fer...
متن کاملOccurrence of twin embryos in the eastern bluebird
We report the first record of presumed twinning in eastern bluebird (Sialia sialis) and provide a review of previously reported twinning events in wild birds. A nest containing twin eastern bluebird nestlings was monitored in 2013 in central Pennsylvania and reported to the Cornell Lab of Ornithology's NestWatch program, a national program where volunteers submit data on wild nesting birds. A p...
متن کاملConjoined Twin
:HSUHVHQWDFRQMRLQHGWZLQ &7FDVHRISUHJQDQF LQ D HDUROG ZRPDQ JUDYLGD SDUD ZKRFDPH IRUKHU¿UVW URXWLQHXOWUDVRXQGDW ZHHNVRIJHVWDWLRQ6KHFRQFHLYHGEVSRQWDQHRXV conception. The patient had a healthy child from a SUHYLRXVSUHJQDQF7KHLQLWLDOXOWUDVRXQGUHYHDOHG two fetuses with a fused thorax and abdomen, two spines with an unusual extension, one beating heart, VKDUHG OLYHU DFURVV WKH IHWXVHV IRXU NLGQHV W...
متن کاملLeft-right patterning in Xenopus conjoined twin embryos requires serotonin signaling and gap junctions.
A number of processes operating during the first cell cleavages enable the left-right (LR) axis to be consistently oriented during Xenopus laevis development. Prior work showed that secondary organizers induced in frog embryos after cleavage stages (i.e. conjoined twins arising from ectopic induced primary axes) correctly pattern their own LR axis only when a primary (early) organizer is also p...
متن کاملPerinatal Risks Associated with Early Vanishing Twin Syndrome following Transfer of Cleavage- or Blastocyst-Stage Embryos
Objective. To investigate whether the perinatal risks associated with early vanishing twin (VT) syndrome differ between cleavage- or blastocyst-stage embryo transfers (ET) in fresh in vitro fertilization (IVF) cycles. Methods. Retrospective, single-center, cohort study of IVF cycles with fresh cleavage- or blastocyst-stage ETs resulting in a live singleton birth. The incidence of preterm birth ...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1976
ISSN: 0032-5791
DOI: 10.3382/ps.0551976