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Nuclease S1 (EC 3.1.30.1) is an endonuclease enzyme that splits single-stranded DNA (ssDNA) and RNA into oligo- or mononucleotides. This enzyme catalyses the following chemical reaction Endonucleolytic cleavage to 5'-phosphomononucleotide and 5'-phosphooligonucleotide end-products
Due to the anti-parallel nature of DNA, this means the 3' end of the template strand is upstream of the gene and the 5' end is downstream. Some genes on the same DNA molecule may be transcribed in opposite directions. This means the upstream and downstream areas of the molecule may change depending on which gene is used as the reference.
Transforming growth factor-β (TGF-β) is a superfamily of cytokines that play a significant upstream role in regulating of morphogenesis, homeostasis, cell proliferation, and differentiation. [2] The significance of TGF-β is apparent with the human diseases that occur when TGF-β processes are disrupted, such as cancer, and skeletal ...
Asymmetry in the synthesis of leading and lagging strands. S phase (Synthesis phase) is the phase of the cell cycle in which DNA is replicated, occurring between G 1 phase and G 2 phase. [1]
Together, this sudden activation of the G1 cyclin positive feedback loop defines the Start point that is key to making the G1/S transition distinct and abrupt. Once the CDK activity threshold is passed and feedback is activated, fluctuations in the upstream input signals no longer have an influence on the fate of the cell cycle. [14]
The 5' UTR of prokaryotes consists of the Shine–Dalgarno sequence (5'-AGGAGGU-3'). [6] This sequence is found 3-10 base pairs upstream from the initiation codon. The initiation codon is the start site of translation into protein.
As promoters are typically immediately adjacent to the gene in question, positions in the promoter are designated relative to the transcriptional start site, where transcription of DNA begins for a particular gene (i.e., positions upstream are negative numbers counting back from -1, for example -100 is a position 100 base pairs upstream).
Upstream and Downstream, the notional directions which lie "towards" and "away from" the author of a piece of software, relative to the speaker See also [ edit ]