منابع مشابه
Needhi Bhalla: Chromosomes do the most amazing things
Meiotic cell division is a reductive process that halves the cell's genetic complement in preparation for mating. While analogous to mitotic division, meiosis additionally involves the pairing and crossing-over of homologous chromosomes to generate additional genetic diversity in daughter cells. This is accomplished via a precisely choreographed chromosomal dance, with checkpoints in place to c...
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Meiotic chromosome segregation in mouse oocytes seems to rely on highly stable cohesins and CENP-A produced in the fetus and not replenished during postnatal life. Hence, demise of these proteins may underpin declining oocyte quality in ageing mammals and thus marks a major problem of reproductive health in humans.
متن کاملThe Amazing Osteocyte
The last decade has provided a virtual explosion of data on the molecular biology and function of osteocytes. Far from being the "passive placeholder in bone," this cell has been found to have numerous functions, such as acting as an orchestrator of bone remodeling through regulation of both osteoclast and osteoblast activity and also functioning as an endocrine cell. The osteocyte is a source ...
متن کاملAmazing DPs
Data and Previous Literature: Elliott (1971) points out that DPs introduced by emotive factive predicates (cf. (1)) have exclamative interpretations. Grimshaw (1979) establishes a parallelism between DPs that are introduced by predicates that also take interrogative clauses (Concealed Questions CQs, (2)) and DPs that are introduced by predicates that also take exclamative clauses (cf. (2b)); sh...
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The usual conformation of DNA is a right-handed double helix (B-DNA). DNA with stretches of alternating purine-pyrimidine (G-C or A-T) can form a left-handed helix (Z-DNA). The transition B----Z, facilitated by the presence of divalent cations, cytosine methylation, or constraints on DNA such as superhelicity may play a role in the regulation of gene expression and/or in DNA compaction (Zarling...
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ژورنال
عنوان ژورنال: Cell Research
سال: 2003
ISSN: 1001-0602,1748-7838
DOI: 10.1038/sj.cr.7290166