Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
In addition to and in conjunction with its transport functions, the placenta possesses metabolic activity consisting of many enzyme systems which function int he biosynthesis, degradation, and biotransformation of numerous endogenous compounds.
Eckhoff, Gary A.
"Transplacental Passage of Drugs and other Exogenous Compounds: A Review - Part II,"
Iowa State University Veterinarian: Vol. 34
, Article 8.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol34/iss2/8