Leaves from the plant classified under the species Brassica rapa subsp. chinensis (L.) Hanelt, commonly known as Pak-choi or Paksoi or Pak-tsoi or Pak-soi or Celery mustard. The part consumed/analysed is not specified. When relevant, information on the part consumed/analysed has to be reported with additional facet descriptors. In case of data collections related to legislations, the default part consumed/analysed is the one defined in the applicable legislation.