Type C particles produced in a great amount by the exocrine pancreas of normal C57BL mice have been found by electron microscopy to retain their immature morphology in C57BL/6J mice and to develop into the mature form in C57BL/He mice. Examining F1, F2 and Bc1 hybrids between the 2 strains, evidence of a dominant allelism for the immature phenotype was found.
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