This has been expected for a long time.

Click chemistry is quite amazing. Having done thousands of these things in lab, all you really need to do with the classic reaction is throw in some vitamin C in an aqueous copper solution and boom, you've got rapid labeling of cells, tissues, etc. It's quite an amazing reaction. There are versions that are more biocompatible and don't even require copper these days. A very useful technique that is widely used. Fantastic, very clean way of creating protein conjugates too.