Sentence:  The products of allelic forms of the same gene are known as <WSD>"allotypes</WSD>". <WSD>Allotypes</WSD> are now known for all mouse heavy chains (Stall, 1995). There are no known serologically detectable <WSD>allotypes</WSD> of mouse κ chains. 
Meaning of the word marked with <WSD> tags:  An immunoglobulin allotype; the allele of the antibody chains found in an individual.