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.
D. nobile samples were collected from wild Danxia rock (WDR) (A), large Danxia stone (LDS) (>20 cm × 20 cm) in a greenhouse (B), broken Danxia stone (BDS) (<2 cm × 2 cm) in a greenhouse (C), broken coarse sandstone (BCSS) (<2 cm × 2 cm) in a greenhouse (D), and wood spile (WS) in a greenhouse (E).
