The D antigen can be expressed in varying
strengths. Usually it is plainly “positive”
(like in most people) or “negative” (like me!) but occasionally it can be expressed weakly. Back in the
day this was described as “Du”… but
not any more.
Clicking here gives
a nice little synopsis of the matter, and tyhere’s a link to a video and a podcast
there too.
Weak D is pretty obscure – I found two today…
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