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.
Companion cell protoplast obtained from citrus tristeza virus–vectored green fluorescent protein (GFP)–transformed phloem cells. Both sieve elements and companion cells show GFP fluorescence as described by Folimonov et al. (2007). Each cell was viewed under brightfield microscopy (A); fluorescence microscopy (Rhodamine filter; Ex: BP 545/25, Em: BP 525/50) for red and green fluorescence (B); and under DAPI filter (Hoechst 3342; Ex: G365, Em: BP 445/50) for blue fluorescence (C).
