Extracellular antibodies are ideal research tools for cell-surface proteins.

No permeabilization/fixation because using extracellular antibodies allows you to work with live cells!

Benefits of live cell imaging:
✓ Monitor cell movement
✓ Study protein transport across the cell
✓ Investigate protein internalization

Ghrelin is a 28 amino acid peptide, acylated on a serine residue which is essential for its biological activity. In rodents, an additional form of the peptide could be purified. The peptide is released from the stomach and exerts its effect to ghrelin receptor (GHS-R). GHS-R is a member of the G-protein coupled receptor (GPCR) superfamily. Like all members, the receptor has seven transmembrane spanning domains and upon activation it stimulates phospholipase C, thereby increasing IP₃ and intracellular Ca²⁺ levels. GHS-R is expressed in the hypothalamus, pituitary and hippocampus.