Forms part of the ribosomal stalk which helps the ribosome interact with GTP-bound translation factors. Is thus essential for accurate translation. Homodimer. Part of the 50S ribosomal subunit; present in 6 copies per ribosome. Forms part of the ribosomal stalk which helps the ribosome interact with GTP-bound translation factors. Forms a heptameric L10(L12)2(L12)2(L12)2 complex, where L10 forms an elongated spine to which 3 L12 dimers bind in a sequential fashion. Belongs to the bacterial ribosomal protein bL12 family.