Nexu 7 as USB OTG host

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http://forums.androidcentral.com – I am writing a Java program where I want the Nexus 7 to act as a USB host for a custom USB device. It would seem I need an OTG cable, but the Nexus 7 has a micro B type connector. It is my understanding that an OTG connector is type A, which will not fit into a micro B slot. The documentation for the Nexus 7 says it can serve as a USB host. Is there a micro B type OTG cable? (HowTos)