Three factors are important in maintaining low O2 concentrations in nodules. 

First, entry of O2 into the nodule is controlled by a variable‐permeability barrier in the nodule parenchyma

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#Id: 9483

#XL - R Botany

Late blight disease (A), caused by the oomycete pathogen Phytophthora infestans

Black stem rust, which results from infection by the basidiomycete Puccinia graminis

Global banana (Musa spp.) production is under threat from black Sigatoka disease Mycosphaerella fijiensis.

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#XL - R Botany

There are three D cyclins in mammals:

cyclins D1, D2, and D3

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#XL - R Botany

Apical meristem

Located  at  root  and  shoot  tips and produce primary tissues are called apical meristems

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#XL - S Microbiology

The nitrate reductase dimer- Three binding domains

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#XL - T Zoology

Integrins are involved in biological activities, includes: 

Extravasation

Cell-to-cell adhesion

Cell migration

Receptors for certain viruses

Angiogenesis

Apoptosis