The recirculation of urea helps to trap urea in the renal medulla and contributes to the hyperosmolarity of the renal medulla.

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#Id: 1221

#Unit 7. System Physiology – Animal

The receptor for PTH is coupled, via a Gs protein, to adenylyl cyclase.

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#Id: 6103

#Unit 3. Fundamental Processes

EMS causes ethylation of the bases in DNA at the 7-N and the 6-O positions. When 7-ethylguanine is produced, it base-pairs with thymine to cause G:C → A:T transitions.

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#Id: 443

#Unit 2. Cellular Organization

Individual nucleosomes can be obtained by treating chromatin with the endonuclease micrococcal nuclease (MNase), which cuts the DNA at linker DNA.

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#Id: 4042

#Unit 2. Cellular Organization

In contrast, there is another category of heterochromatin, called facultative heterochromatin, in which regions of euchromatin are converted to a heterochromatic state.

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#Id: 10266

#Unit 6. System Physiology – Plant

GA stimulates onset of PCD in aleurone layers of barley (Hordeum vulgare) and wheat (Triticum aestivum), ABA postpones PCD