Please note: Due to a scheduled maintenance, BOLD Systems will be offline from Friday Apr 26, 2024 4pm EDT to Sunday Apr 28, 2024 7pm EDT. We apologize for the inconvenience.
You've been logged out. Click here to log back in.
full article at Wikipedia
![( - Pyr001936) @14 [ ] Copyright (2010) Zhaofu Yang Northwest Agriculture and Forest University](http://v3.boldsystems.org/pics/_w300/CNPYB/IMG_7759%2B1272058156.JPG "( - Pyr001936) {} [ ] Copyright (2010)")
![( - Pyr001935) @14 [ ] Copyright (2010) Zhaofu Yang Northwest Agriculture and Forest University](http://v3.boldsystems.org/pics/_w300/CNPYB/IMG_7758%2B1272058108.JPG "( - Pyr001935) {} [ ] Copyright (2010)")
![( - Pyr001937) @13 [ ] Copyright (2010) Zhaofu Yang Northwest Agriculture and Forest University](http://v3.boldsystems.org/pics/_w300/CNPYB/IMG_7760%2B1272058168.JPG "( - Pyr001937) {} [ ] Copyright (2010)")
![( - SDNU-INS-01053) @11 [ ] CreativeCommons - Attribution Non-Commercial Share-Alike (2020) Tengteng Liu Shandong Normal University](http://v3.boldsystems.org/pics/_w300/INSSD/SDNU-INS-01053%2B1600121956.JPG "( - SDNU-INS-01053) {} [ ] CreativeCommons - Attribution Non-Commercial Share-Alike (2020)")
![( - SDNU-INS-01054) @11 [ ] CreativeCommons - Attribution Non-Commercial Share-Alike (2020) Tengteng Liu Shandong Normal University](http://v3.boldsystems.org/pics/_w300/INSSD/SDNU-INS-01054%2B1600121956.JPG "( - SDNU-INS-01054) {} [ ] CreativeCommons - Attribution Non-Commercial Share-Alike (2020)")
![( - SDNU-INS-03992) @11 [ ] CreativeCommons - Attribution Non-Commercial Share-Alike (2021) Tengteng Liu Shandong Normal University](http://v3.boldsystems.org/pics/_w300/INSSD/SDNU-INS-03992%2B1610928168.JPG "( - SDNU-INS-03992) {} [ ] CreativeCommons - Attribution Non-Commercial Share-Alike (2021)")
