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.
Variation in intron size between knirps and knirps‐related genes regulates timing of expression. The shorter version of the gene (Kni) is expressed at early stages of development when the cell cycle is short (left), but the longer version (Knrl) is not (right). Modified from Rothe et al. (1994).
