Summary
A ring Y chromosome was found in a male showing growth retardation and aspermia but normally developed external genitalia. The ring does not display either the characteristic brilliant Y fluorescence or the typical latereplicating heterochromatin.
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Steinbach, P., Fabry, H. & Scholz, W. Unstable ring Y chromosome in an aspermic male. Hum Genet 47, 227–231 (1979). https://doi.org/10.1007/BF00321013
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DOI: https://doi.org/10.1007/BF00321013