Challenges of Genetic testing of Inherited(遺傳性) retinal(視網(wǎng)膜的) dystrophy(營養(yǎng)不良) include:()
A.The clinical diagnosis may or may not be specific
B.The inheritance mode is not clear for the isolated cases
C.The progression(進展) of condition can take several decades
D.Locus heterogeneity(位點差異性)