Definition of "isotype" [isotype]

• A biological specimen that is a duplicate of a holotype. (noun)
• Any of the subclasses of immunoglobulins defined by the chemical and antigenic characteristics of their constant regions. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "We asked if the medical isotype shortage caused by the shutdown of the Chalk River nuclear reactor will have any impact on my treatment."
• "The Smu tandem repeat region is critical for Ig isotype switching in the absence of Msh2."
• "Apart from being the acronym of 'International System Of TYpographicPicture Education, isotype is also Greek for' the same sign '."