P stands for probability here. To calculate the p-value, the chi-square test is used in statistics. The different values of p indicates the different hypothesis interpretation, are given below. 

I. P≤ 0.05; Hypothesis rejected.

II. P>.05; Hypothesis Accepted

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#Unit 4. Cell Communication and Cell Signaling

In Notch/Delta pathway, 

signaling molecule is Delta, an integral membrane protein bound to the surface of the signaling cell.

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#Unit 4. Cell Communication and Cell Signaling

In Notch/Delta pathway, 

Notch is receptor protein, on a neighboring responding cell

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#Unit 4. Cell Communication and Cell Signaling

In the absence of Delta, 

TM subunit of Notch on the surface of a responding cell is non-covalently associated with its extracellular subunit; extracellular domain is folded

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#Unit 4. Cell Communication and Cell Signaling

Folded extracellular domain cannot

be cleaved by the cell-surface ADAM 10.

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#Unit 4. Cell Communication and Cell Signaling

ADAM 10 is a matrix metalloprotease, a member

of a class of metal-containing enzymes that cleave the

extracellular segments of target proteins.

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#Unit 4. Cell Communication and Cell Signaling

ADAM is an abbreviation for a disintegrin and

Metalloprotease (disintegrin is a conserved protein domain that binds integrins and disrupts cell-matrix interactions)