Regulation and development of protein translation in neuronal processes

A magnetic head assembly for an elongated integral type magnetic head. The assembly includes a plurality of elongated integral magnetic head bodies formed on a substrate. The head bodies are formed as a first block and a second block, where each block has a comb-shape and includes a connection part that carries a plurality of the magnetic head bodies. The head bodies extend parallel to each other such that the magnetic head bodies held on the comb-shaped first block and the magnetic head bodies held on the comb-shaped second block mesh with each other. The first and second block are separated from each other by applying a selective removal process for removing a strip-like boundary region formed to surround each of the first and Second blocks by an etching process. Each magnetic head member is separable from each other for mounting in a magnetic disk device.