Tin-containing electroplating baths having a combination of certain brightening agents provide tin-containing solder deposits having reduced void formation and smooth morphology. The method can also include adding an additive, testing the humidity level of the adobe mixture and adjusting the humidity of the adobe mixture when the humidity is not within a predetermined humidity range, and preheating a mold. Thus, the compressible figure can be readily compacted by compression thereof into a compact form. Also provided are uses of these protein complexes for stimulating or inducing cell migration andor proliferation in wound healing, tissue engineering, cosmetic and therapeutic treatments such as skin replacement, skin replenishment and treatment of burns where epithelial cell migration is required.