Definition of "allotype"

The allotype female has one T2 deformed (fig. 75D), while the other one is normally developed.

2007, Ivana Karanovic, Candoninae (Ostracoda) from the Pilbara Region in Western Australia, Koninklijke Brill, page 182

Until recently, different C-region allotypes were explained by allelic genes which each encoded a different but closely related protein sequence.

2007, I. D. Walker, G. Winter, D. J. Worthington, Chapter 2: Structural Investigations of Peptides and Proteins: I: Primary Structure and Chemical Modification, R. C. Sheppard, Amino Acids, Peptides and Proteins, Volume 8, The Chemical Society, page 145

The products of allelic forms of the same gene are known as allotypes. Allotypes are now known for all mouse heavy chains (Stall, 1995). There are no known serologically detectable allotypes of mouse κ chains.

1996, James W. Goding, Monoclonal Antibodies: Principles and Practice, 3rd edition, Academic Press, page 102

Since different individuals of the same species may have different allotypes, these determinants can be used as genetic markers.The most common technique used for allotype determination is hemagglutination-inhibition.

2007, Janardan P. Pandey, “7: Genetics of Immunoglobulins”, in Gabriel Virella, editor, Medical Immunology, 6th edition, Informa Healthcare, page 77

Allotypes were originally defined by antisera that differentiated allelic variants of immunoglobulin (Ig) subclasses. The allotype is due to the existence of different alleles at the genetic locus that determines the expression of a given determinant.

2009, Julius M. Cruse, Robert E. Lewis, Illustrated Dictionary of Immunology, 3rd edition, Taylor & Francis (CRC Press), page 32