The extracellular coat, or zona pellucida, of mammal ian eggs contains species-specific receptors to which sperm bind as a prelude to fertilization. In mice, ZP3, one of only three zona pellucida glycoproreins, serves as sperm receptor. Acrosome-intact, but not acrosome-reacted, mouse sperm recognize and interact with specific O-linked oligosaccharides of ZP3 resulting in sperm-egg binding. Bin...

A general construction of equations satisfied by the components of z-functions is given by considering the tensor products of modules. As an example, the homogeneous basic realization of,'ll is given, leading to NLS equations. O. Introduction Some years ago, Date, Jimbo, Kashiwara, and Miwa [2, 6] showed that solutions of many soliton equations can be considered as group orbits of highest weigh...

Many graphs which are encountered in the study of graph theory are characterized by a type of configuration or subgraph they possess. However, there are occasions when such graphs are more easily defined or described by the kind of subgraphs they are not permitted to contain. For example, a tree can be defined as a connected graph which contains no cycles, and Kuratowski [22] characterized plan...