Geltrex as Matrigel is produced from EHS tumor. The name is different as Matrigel is registered by Corning Life Sciences and BD Biosciences. In our laboratory we switch from one to the other without any differences when using mTesR or E8 medium. The advantage of Geltrex on Matrigel is that there is no batch to batch concentration, whatever the batch you use it at 1/100 dilution. With Matrigel you have to adjust the dilution for each batch you buy according to the CoA.