Methods are described for mapping a pathway of differentiation of a population of embryonic cells that includes exposing the cells to an exogenous factor and measuring gene expression products that are characteristic of a particular cell type or lineage. The coating includes three infrared-reflection film regions, which may each comprise silver. The outboard portion of the stern drive is rotatable relative to the inboard portion, about a second axis transverse to the motor output drive axis, in raisingloweringtrimming directions. The lens also allows a portion of the light it receives from the light source to be transmitted therethrough, providing downlight from the light fixture. The knowledge thus refined is utilized to construct a multidimensional semantic network, or MSN.