The boxes represent the objects (classes) that make up PyEvolve
Taken from "PyEvolve: a toolkit for statistical modelling of molecular evolution"
BMC Bioinformatics 2004;5():1-1.
Published online 5 Jan 2004
Copyright © 2004 Butterfield et al; licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL.The filled diamonds, as specified by the Unified Modelling language specification, indicate the object at which the diamonds end has the connected objects as essential components.