Retraction: Expression of phosphodiesterase type 5A in human spermatozoa and influence of its inhibition on motility and functional sperm parameters.

The paper entitled "Expression of phosphodiesterase type 5A in human spermatozoa and influence of its inhibition on motility and functional sperm parameters" by C. Foresta et al, which was published online on 1 July 2010, has been withdrawn at the authors' request.