Fig. 4From: Gold nanoparticle distribution in advanced in vitro and ex vivo human placental barrier modelsUptake of Au-4-COONa NPs in BeWo cells after 24 h. a TEM micrographs showing an overview of two BeWo cells. Two different locations with internalized AuNPs (white squares b and c) are presented at higher magnifications (b, b' and c, c')Back to article page