RETRACTED: Sphingosine kinase-1/sphingosine-1-phosphate receptor type 1 signalling axis is induced by transforming growth factor-β1 and stimulates cell migration in RAW264.7 macrophages

This article has been retracted at the request of the authors. Part of the data presented in this paper at the Capital Medical University as part of the project approved by the Ministry of Education in China. This paper was submitted and published without permission of the Capital Medical University.