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Malcolm Needs

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  1. Malcolm Needs's post in Does anyone knows what does “+s” mean? was marked as the answer   
    It simply means that the P1 antigen is particularly strongly expressed on these red cell samples.  Therefore, if you come across a weak anti-P1, it may apparently react with these particular red cell samples, whilst apparently not with, for example, the third red cell sample shown in your antigram.  Although not identical to dosage, per se, it is fairly synonymous with dosage at a phenotypical level.
    The strength of the expression of the P1 antigen is an inherited trait.
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