Keywords: 2D; two dimensional; 2PP; two-photon hydrogel polymerization; 3D; three-dimensional; AFM; atomic force microscopy; AgNP; silver nanoparticles; AuNP; gold nanoparticle; α-SMA; alpha-smooth muscle actin; RGD; Arg-Gly-Asp; BMP; bone morphogenetic protein; C