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.
Transmission electron micrographs of the microspores in U87B1-706A (A–J) and 706B (K–T). (A,F,K,P) Td, tetrad stage; (B,G,L,Q) Eun, early uninucleate stage; (C,H,M,R) Lun, late uninucleate stage; (D,I,N,S) Bn, binucleate stage; and (E,J,O,T) Tn, trinucleate stage. C, callose; PE, primexine; Se, sexine; DM, deposit materials; PM, plasma membrane; In, intine. Scale bars are 3 μm in (A–T).
