Preferably, {HEAD ~ the regenerable cells} in {TAIL ~ such tissue cultures} will be embryos, protoplasts, meristematic cells, callus, pollen, leaves, anthers, roots, root tips, flowers, seeds, pods or stems 
in
Preferably , { HEAD ~ the regenerable cells } in { TAIL ~ such tissue cultures } will be embryos , protoplasts , meristematic cells , callus , pollen , leaves , anthers , roots , root tips , flowers , seeds , pods or stems
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH