How Type III CRISPR targets DNA during transcription

Some bacterial defenses attack viral DNA only while it is being used

Some CRISPR systems can attack both viral RNA and viral DNA. In certain systems, however, the DNA can be attacked only while the virus is using it to make RNA. The defense therefore targets the virus's genetic material when it is active.

Sea turtles use Earth’s field as a map

Loggerhead and green sea turtles can use features of Earth’s magnetic field that vary from place to place. The field helps them tell where they are, not just which direction to go. This was the first magnetic map described in an animal.

Rivers helped build the huge plain below the Himalayas

India’s collision with the Eurasian landmass pushed up the Himalayas. Just south of the mountains, the land sank into a huge low area. Rivers gradually filled it with sand, mud, and other material, creating the Indo-Gangetic Plain.

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How Type III CRISPR targets DNA during transcription

Some bacterial defenses attack viral DNA only while it is being used

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