The Sev RTK is expressed in more cell types than just R7 precursor cells, and it appears to be important in determining the phenotypes of these other cells. Explain how one receptor can induce different phenotypes in different cell types

Joseph Priestley was a famous philosopher of the 18th century, who is famous for his experiments with the air, optics, electricity and soda water. His work was considered to be quantitative because he believes in practical application.

His experiment that leads to the famous discovery of placing a mice in a closed container with the mercuric oxide. He comes to know that mice survived because of common air-oxygen. He then finds the use of oxygen in the process of respiration and its use in the blood.