Examples of guanine

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There seems to be some base specificity, as there are pockets in the protein that favour periodic guanine bases.
Contact with the purines, especially guanine and xanthine, triggers the arrestment response and causes the ticks to cease activity, forming a cluster.
There are 30 adenines in conserved single-stranded positions compared with 26 thymines, 9 guanines and 5 cytosines.
A compositional segmentation of the human mitochondrial genome is related to heterogeneities in the guanine mutation rate.
The most abundant component of the excreta in this tick is guanine.
The point mutations at codon-46 and codon-108 represent transitional pyrimidine (thymine to cytosine) and purine (guanine to adenine) substitutions respectively.
Purines and pyrimidines, including adenine, guanine, cytosine, thymine and uracil, play a major role in terrestrial biochemistry.
Role of guanine nucleotides in coupling adenylate cyclase and serotonin receptors.
Inositol 1,4,5-trisphosphate-induced calcium release and guanine nucleotide-binding proteinmediated periodic calcium rises in golden hamster eggs.
With widely diffused minerals and metal oxides as catalysts, formamide affords all the precursor nucleic bases: purine, adenine, hypoxanthine (bioisomer of guanine), cytosine, uracil and thymine.
The incoming guanine now is paired with the cytosine of the original duplex and the displaced guanine is situated on the major groove side of the newly formed base pair.
Guanine nucleotides are required for progesterone inhibition of amphibian oocytes adenylate cyclase.
The condensation of nucleo-bases adenine or guanine with sugar ribose gives only minute amounts of nucleosides with correct stereochemistry, and synthesis of pyrimidine nucleosides is even more difficult.
While a similar interaction might be made if an adenine were located in this position, replacement by either guanine or thymine would evidently prevent the contact.

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