Human utilization of recombinant proteins of therapeutical interest, a
s hemoglobin, implies that the transgenic host allows a low cost produ
ction of the active proteins with minimal risks of pathogen contaminat
ion. In this regard, the use of transgenic plants could be of great in
terest. In particular, the systems based on plants could be one of the
most economical transgenic system, compared with the others, because
biomass obtention in fields is not expensive.