The first haematopoietic sites in Brachydanio rerio are formed by the "intermediate cell mass", situated between somite and lateral plate. The sequential sites are in the endocardium, pro- and mesonephros. The results are compared with those of Pterophyllum scalare, which has its first blood anlage on the yolk sac.
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Al-Adhami et al. (1977) studied this question.
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