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Figure 2. Characterizations of PMs. (A, B) SEM images of particles, (C) and a cross-sectional

view, (D) particle size distribution, and (E) pore size distribution of the PMs.

Notably, the degradability attribute of the biomaterials is equally important to exploring the

characterization and performance efficacy. To this end, PMs were placed in PBS and incubated for

7 weeks to investigate its degradation properties. As presented in Figure S2, although PLGA was

gradually degraded, the porous structure of PMs remained intact for several weeks, which was the

most suitable carrier for cells, while the slow degradation of PMs favored biomaterial absorption

and tissue formation 49-51 . In addition, we used protein adsorption effects to explore cell adhesion

effects on the surface of the PMs by exposing the PMs to serum proteins and evaluating them using

the Bradford protein assay following the manufacturer's instructions. The results showed that the

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adsorption kinetics of the protein was about 1.40×10 mg/PMs for 30 min, followed by equilibrium.

(Figure S3). Collectively, the characterizations, degradability, and protein adsorption efficacy

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