Patent ID: 8278097

Claim:
A method for forming embryoid bodies comprising the steps of: (A) providing a vessel for embryoid formation having a coating layer formed from a copolymer of monomer (M) represented by the formula (1) having a phosphorylcholine-like group and another monomer, on a vessel surface defining a region for floating-culture of embryonic stem cells: wherein R 1 , R 2 , and R 3 are the same or different groups, and each of said R 1 , R 2 , and R 3 stands for a hydrogen atom, an alkyl or hydroxyalkyl group having 1 to 6 carbon atoms; R 4 stands for an alkyl group having 1 to 6 carbon atoms; R 5 stands for a hydrogen atom or a methyl and n is an integer of 1 to 4; and (B) floating-culturing embryonic stem cells in said vessel for embryoid formation to form embryoid bodies.