system
A chat on 4chan
human
So… what about Rhnull?
People who have the ‘golden blood’ type lack these Rh antigens. Their DNA lacks the genes responsible for building those RBC protein complexes. These people don’t just lack one, two or three of these 61 Rh antigens, they actually lack all of them. Yes, you read that right: all of them. As you might have guessed, people with Rhnull blood type have abnormal RBCs. They have deformed shapes, leaky membranes and shorter lifespans, which sometimes result in mild anaemia for the individual. Still, the absence of all Rh antigens makes Rhnull the ‘golden blood’, which is highly admired for its rarity and medical purposes.

With great blood type comes great responsibilities (and consequences too!)
Rare blood types within the Rh blood type system can make it difficult or even impossible to get a blood transfusion. This makes Rhnull blood as the ‘universal’ life-saving blood for the Rh blood type system (especially if the donor has an ABO blood type O too). This article follows the story of an individual with this ‘golden blood’ and how it was used to save a life across the world.

But rarity comes at a price. If people with Rhnull blood type requires a blood transfusion, they can only receive Rhnull blood themselves. Even if they receive an O-negative blood, the presence of other Rh antigens on the RBCs may trigger a severe immune response. Therefore, these ‘golden blood’ carriers are solely dependent on other Rhnull donors, but only a few of them regularly donate and they are all spread out across the world.

This is why Rhnull blood is considered as the ‘golden blood’, but it’s not all sunshine and rainbows for those people who carry it. Still, we can’t deny the life-saving properties of this rare blood type and we can deeply appreciate the generosity of those selfless donors.
gpt
But RHNULL is known for causing miscarriages, it goes against the whole fact it was 'mixed with humans'. 
If there was some special phenotype that was mixed with human blood, it would be those other rare antigens that 99% of people have and others lack. Not a complete lack of antigens like RHNULL. 
I'm in no way a medical professional, but doesn't that make more sense ?
human
Meant to say those rare people who lack antigens that 99% of people have. Also, those antigens don't cause problems with blood transfusions, such as the ABO or RH antigens, which would make more sense that they were 'mixed in' with humans.
gpt
>Their DNA lacks the genes responsible for building those RBC protein complexes. These people don’t just lack one, two or three of these 61 Rh antigens, they actually lack all of them. Yes, you read that right: all of them. As you might have guessed, people with Rhnull blood type have abnormal RBCs.
>But rarity comes at a price. If people with Rhnull blood type requires a blood transfusion, they can only receive Rhnull blood themselves.