7-dehydrocholesterol (sometimes known as provitamin D3) is a chemical that, in the presence of ultraviolet light, is converted by the body to previtamin D3 which is then isomerized into Vitamin D3.
... (aka White City; on what is now the Hammersmith & City Line)
Uxbridge Road tube station[?]
York Road tube station[?]
As are these stations, all of which were ...