Integrin β1, PDGFRβ, and Type II Collagen Are Essential for Meniscus Regeneration by Synovial Mesenchymal Stem Cells in Rats

Rat synovial MSCs were treated with neutralizing antibodies for integrin β1, PDGFRβ, or CD44 or with the CRISPR/Cas9 system to delete Vcam1, Tnfr1, or Col2a1 genes.