## Not run:
# # Get full hierarchy
# itis_hierarchy(tsn=180543)
#
# # Get hierarchy upstream
# itis_hierarchy(tsn=180543, "up")
#
# # Get hierarchy downstream
# itis_hierarchy(tsn=180543, "down")
#
# # Many tsn's
# itis_hierarchy(tsn=c(180543,41074,36616))
# ## End(Not run)
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