Use the following to answer questions:
The diagram below shows the steps used in microarray analysis to detect differences in expression between tumor tissue and normal tissue. 
-At which step does hybridization with oligonucleotides occur?
Definitions:
Accounts Payable
Money owed by a company to its creditors for goods or services that have been delivered or used, but not yet paid for.
Foreign Currency Units
Units of foreign currency that are used as a medium of exchange for international transactions or investments.
Spot Rate
The current market price at which a particular currency can be bought or sold for immediate delivery.
Forward Rate
The agreed-upon exchange rate for a currency transaction that will occur at a future date.
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