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The only immunoglobulin class with members able to cross the placental barrier is _________.
Networks
Sets of nodes (which can be individuals, organizations, computers, etc.) connected by relationships or communication paths, facilitating the exchange of information or resources.
Norms
Socially accepted rules or standards of behavior expected of members within a group or society.
Social Group
A collection of individuals who interact with one another, share similar characteristics, and collectively have a sense of unity or identity.
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