New BeWo cells are a human choriocarcinoma cell line used in placental barrier research and toxicology studies. These cells are utilized for investigating transport mechanisms across the placenta and for assessing the impact of various substances on placental function., These cells are supplied as viable cells, with quantities of either 1M or 1.7M cells per vial. They are viable until passage 25. The passage numbers range from 5 to 15.