Crossen P E
Clin Genet. 1975 Sep;8(3):218-22. doi: 10.1111/j.1399-0004.1975.tb01497.x.
The centromeric banding pattern of chromosomes 19 exhibited considerable variation. The variants were present in the majority of cells from an individual and consisted of additional dark-staining areas. There was no abnormal phenotypic effect associated with any variant and it is concluded that these additional dark-staining areas do not contain any functional genes.
19号染色体的着丝粒带型表现出相当大的变异。这些变异存在于个体的大多数细胞中，由额外的深色染色区域组成。没有任何变异与异常的表型效应相关，因此得出结论，这些额外的深色染色区域不包含任何功能基因。
