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Hemolytic disease of the newborn (HDN) arising from MNSs incompatibility is rare, with few reports of prolonged anemia and reticulocytopenia following HDN. We report the younger of 2 male siblings, both of whom had anti-M-induced HDN and anemia persisting for over a month. Peripheral reticulocytes remained inappropriately low for the degree of anemia, and they needed multiple red cell transfusions. Viral infections were ruled out. Corticosteroids were given for suspected pure red cell aplasia. Anemia and reticulocytopenia subsequently improved. Colony-forming unit erythroid assay revealed erythropoietic suppression of M antigen-positive erythroid precursor cells cultured with maternal or infant sera containing anti-M. In conclusion, maternal anti-M caused HDN and prolonged anemia by erythropoietic suppression in 2 siblings.

Every compact metric space X is homeomorphically embedded in an ω-algebraic domain D as the set of minimal limit (that is, non-finite) elements. Moreover, X is a retract of the set L(D) of all limit elements of D. Such a domain D can be chosen so that it has property M and finite-branching, and the height of L(D) is equal to the small inductive dimension of X. We also show that the small inductive dimension of L(D) as a topological space is equal to the height of L(D) for domains with property M. These results give a characterisation of the dimension of a space X as the minimal height of L(D) in which X is embedded as the set of minimal elements. The domain in which we embed an n-dimensional compact metric space X (n 6 ∞) has a concrete structure in that it consists of finite/infinite sequences in {0, 1, ⊥} with at most n copies of ⊥. Proposition 6.7. When P is a subspace of a domain D with the subspace topology of the Scott topology of D, ind P > height P. Proof. Let n = height P. A chain of length n has dimension n by Proposition 6.5 (1), and is embedded in P as a subspace. The result then follows by heredity (Proposition 6.3). Lemma 6.8. (1) If D is a domain and A is a closed subset of D, then A is also a domain such that K(A) = A ∩ K(D). (2) In addition, when D has property M, A also has property M.

Abstract. We study domain representations induced by dyadic subbases and show that a proper dyadic subbase of a second-countable regular space X induces an embedding of X in the set of minimal limit elements of a subdomain D of t0, 1, Ku ω . In particular, if X is compact, then X is a retract of the set of limit elements of D.