A leather bag made from Tyrannosaurus rex cells failed to sell on Thursday, the Paris auction house Drouot said, commenting that bids were well below expected.Auctioneers Giquello had touted the “one-of-a-kind” piece to sell for more than US$500,000 but bids barely broke the US$150,000 mark, said the Drouot house where the sale took place.Unveiled in the spring in Amsterdam, the bag was created from traces of collagen from the femur of a T. rex found in the US state of Montana 25 years ago.“In recent years, we’ve developed techniques – biotechnologies that allow us to instruct a cell culture to produce, so to speak, genuine T. rex skin in the laboratory,” said Iacopo Briano, a palaeontology expert associated with the sale, before the auction.The “T. rex leather” bag is displayed on Tuesday ahead of its auction in Paris. Photo: AFPHe noted the material differs from vegan leather, which is mostly made from plastic.