Even though PXR was initially identified as a xenobiotic receptor, emerging evidence has pointed to an equally important role of PXR as an endobiotic receptor that responds to a wide array of endogenous chemicals (endobiotics), such as bile acids and their intermediates, as well as certain steroid hormones.

The Red Rectangle is a bipolar nebula with a remarkable spectrum in which emission is excited by the light of the central star HD44179.

Picasso changed, or was changed, from a capital painter, known as such a painter should be known, into a monstre sacré, a holy cow surrounded with an enormous, self-perpetuating, inescapable, and generally irrelevant notoriety.

Time passed; Moira grew up, chronologically; but Sir Watney went on treating her as a spoilt child, went on being enchanted by her birdy chirrupings and ingenuousnesses and impertinent enfant-terrible-isms.