Layers suitable for stacking in three dimensional, multi-layer modules are formed by interconnecting a ball grid array electronic package to an interposer layer which routes electronic signals to an access plane. The apparatus includes a tool that corresponds to a joint portion of the structural member. The compositions are either oral\u2014for relief and remission of proliferative skin disorders or topical\u2014for the treatment and management of pain. The resulting setup used for generating femtosecond laser pulses. This results in a headlight with variable light emission characteristics, which is mechanically particularly simple to construct, is operationally reliable, and is rapid to react. Isolated nucleic acid fragments and recombinant constructs comprising such fragments encoding \u039417 desaturases along with a method of making long-chain polyunsaturated fatty acids using these \u039417 desaturases in oleaginous yeast are disclosed.