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