Task: Answer Verification
Input (English): Question: Are human placenta-derived neurospheres susceptible to transformation after extensive in vitro expansion?
Answer: We have developed a cancer stem cell model starting from normal human stem cells derived from amniotic and chorionic placenta membranes. These cells are able to differentiate into neural cell lineages and to undergo spontaneous transformations and acquire an NB-like phenotype.
Output (English): yes