An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
System design space for the model in Fig. 1. In each phenotypic region the pools associated with the variables X1 and X2 are represented graphically. The relative thickness of the arrows suggests the dominant fluxes for each pool. See legend for Fig. 2 and text for discussion.