A condition of undetermined ownership as of an estate that has not yet been assigned.
未决，未定归属待定的状态，如尚未分配的房产。
Expression of the PTEN tumor suppressor is frequently lost in breast cancer in the absence of mutation or promoter methylation through as yet undetermined mechanisms.
PTEN肿瘤抑制因子在乳腺癌中虽常呈失表达，但并不是通过基因突变或促进子甲基化而实现的，因此其失表达的机制还不清楚。
Expression of the PTEN tumor suppressor is frequently lost in breast cancer in the absence of mutation or promoter methylation through as yet undetermined mechanisms.
PTEN肿瘤抑制因子在乳腺癌中虽常呈失表达，但并不是通过基因突变或促进子甲基化而实现的，因此其失表达的机制还不清楚。
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