Adhesion in development: an historical overview.

My purpose here is to provide brief historical overviews of three related subjects conceptually fundamental to the broader subject of "cell adhesion in development." These subjects are (1) the evolution of our present understanding of how animal cells cohere; (2) the question of what principles underlie the ability of embryonic cell populations to organize themselves into anatomically correct structures; and (3) the ongoing effort to understand the origins of the "recognition specificity" evinced in the latter phenomenon. Because this review must be brief, it is not possible to mention all of the significant advances, many of which will be referenced in a recent more detailed review of this subject (Grunwald, 1991). For the same reason, the important work on cell adhesion in nonvertebrate systems is not included.