The process in which the developmental fate of a cell becomes restricted such that it will develop into a stomatal guard cell. Guard cells are located in the leaf epidermis and pairwise surround stomatal pores, which allow CO2 influx for photosynthetic carbon fixation and water loss via transpiration to the atmosphere. [ http://www.ncbi.nlm.nih.gov/pubmed/17259259 ]
This is just here as a test because I lose it