We are going to discontinue the service to provide secundary fluorescently labelled antibodies. It was useful to maintain a relatively fresh stock that is continuously probed for functionality, this way users did not need to worry about out-of-date fluorescent antibodies. However, this service is too expensive to keep, and if users keep stocks as 50% glycerol solutions in -20 C freezers long term storage is very stable. The problem of drying and getting aggregates of non-functional antibodies is minimised by this procedure. Our advice is to generate a stock of secundary antibodies and share this among department members (one or two persons responsible for the ordering, aliquotting and distribution clarifies cost streams and inventory overview). A handy tool to keep track of inventories is supplied as freeware by Quartzy.