Fig. 2From: Translocation of (ultra)fine particles and nanoparticles across the placenta; a systematic review on the evidence of in vitro, ex vivo, and in vivo studiesPie charts describing the characteristics of the included studies. Different models (a) were used to assess if (ultra)fine particles and NPs (b) can bypass the placenta (c) using a variety of detection methods (d). NPs: nanoparticlesBack to article page