There are two de novo methyltransferases (Dnmt3A and Dnmt3B) in the mouse; they have different target sites, and both are essential for development.

TLS Online TPP Program

#Id: 4503

#Unit 13. Methods in Biology

When the positive terminal is on the left arm, the lead is known as the aVL lead.

TLS Online TPP Program

#Id: 4504

#Unit 13. Methods in Biology

When the positive terminal is on the left leg, the lead is known as the aVF lead.

TLS Online TPP Program

#Id: 4505

#Unit 13. Methods in Biology

Electroencephalography (EEG)

A method to record an electrogram of the spontaneous electrical activity of the brain.

TLS Online TPP Program

#Id: 4506

#Unit 13. Methods in Biology

EEG electrodes placed along the scalp (non-invasive) called scalp EEG.

TLS Online TPP Program

#Id: 4507

#Unit 13. Methods in Biology

Electrocorticography, involving surgical placement of electrodes, is sometimes called "intracranial EEG". 

TLS Online TPP Program

#Id: 4508

#Unit 13. Methods in Biology

EEG waves are not action potentials.

The EEG waves originate from alternating excitatory and inhibitory synaptic potentials that produce sufficient extracellular current flow across the cortex.