The pink intranuclear inclusions in the erythroid precursors seen here are characteristic for parvovirus infection .

核内可见粉红色包含体是病毒感染的典型特征。

Other factors that affect erythropoiesis are the supply of nutrients ( eg , iron , folate , or vitamin b12 ) and cell-cell interactions between erythroid precursors , lymphoid cells , and other components of the hematopoietic microenvironment .

其他影响红细胞生成的因素有营养素的供应（如铁，叶酸或维生素b12），和红细胞前体、淋巴细胞之间的相互作用，以及造血微环境中的其他环节。