During early cleavage, each asymmetrical division produces:

• One founder cell (denoted AB, E, MS, C, and D) that produces differentiated descendants
• One stem cell (the P1–P4 lineage) 

TLS Online TPP Program

#Id: 5739

#Unit 10. Ecological Principles

Paul and Ann Ehrlich (1981) proposed an alternative called the rivet hypothesis Some species play a small but critical role in keeping the plane, the community, airborne, while other species do not

TLS Online TPP Program

#Id: 9567

#Unit 11. Evolution and Behavior

Cope’s rule:  A proposed generalization that individual body size in animals tends to increase during evolution.

TLS Online TPP Program

#Id: 1770

#Unit 4. Cell Communication and Cell Signaling

CD28 on the T cell and CD80/86 (B7) on the APC provided the costimulatory signal required for T-cell activation.

TLS Online TPP Program

#Id: 1905

#Unit 4. Cell Communication and Cell Signaling

Surface protein on B cell

CR2(CR21)

CD19

TAPA-1(CD81)

 mIg

Igα/ Igβ

(CD79a and CD79B)

 TLR

CD40

B7 (CD80/86)

ICAM-1

MHC-1 and 2

CD 22

TLS Online TPP Program

#Id: 907

#Unit 13. Methods in Biology

Flow cytometry is majorly used with fluorescence dyes and attached antibodies for cells and dyes.