Extract tests were conducted to eliminate variance from PCL surface hydrophobicity. Sheets of the [n]CPP-PCL and PCL control were first sterilized by soaking in 70% ethanol for 30 min, then washed three times with sterile 1x phosphate buffered saline (PBS). The samples were then submerged in serum-free media for 72 h at 37 °C with the surface area-to-volume ratio of 3 cm 2 .mL -1 as described in ISO 10993-12. The eluant media was composed of Dulbecco's Modified Eagle Media (DMEM) with 1% penicillin-streptomycin. Once the samples were removed from the media, fetal bovine serum was added to a final concentration of 10% v/v before application to cells. Human adipose derived mesenchymal stromal cells (MSC) were purchased from Zen Bio (Cryopreserved Adipose Derived Adult Stem Cells: Lot#ASC062118A). The cells were seeded at 4000 cells per well in a 96 well plate and cultured to 80% confluency. Primary controls included the addition of 1% or 15% v/v phosphate buffered saline, and 1%, 5%, and 10% v/v ethanol for positive cell inhibition. Nitrile rubber (Kimtech Purple Nitrile Exam Gloves) and poly (vinyl chloride) (Home Depot PVC, USA) were used as secondary elution controls. After 48 h of eluant media exposure to cells, AlamarBlue was used as an indicator of cellular inhibition and cytotoxicity, based on previously established methods . DMEM base medium (with 1% PS and 10% FBS), without ethanol, PCL or [n]CPP-PCL elutes, was used as baseline to calculate % growth inhibition according to: