xenotransplantation, the use of human biobanks and the use of human stem cells for research, have reached different stages of the process and clear differences exist between different countries.
(the use of human biobanks and the use of human stem cells for research; have reached; different stages of the process) (clear differences; exist; L:between different countries)
the use of human biobanks and the use of human stem cells for research clear differences
have reached exist
different stages of the process
L:between different countries