But until now , scientists didn 't know what it was about the more favorable hla subtypes that conferred protection against hiv .
但时至今日，科学家们仍无法获知更有利的亚型hla是如何使人免受艾滋病毒感染的。
The hla system allows the body to distinguish between its own healthy cells and those infected by foreign invaders , such as viruses .
hla系统使身体能够辨别自身的健康细胞与那些受外来侵害感染的细胞，比如病毒。
The genetic instructions for the newly found amino acid variants resides in a region of chromosome 6 that codes for the hla system .
遗传指令中新发现的氨基酸变异存在于染色体6的区域中，为hla系统编码。
This was significant because hla molecules primarily distinguish one individual , and his or her cells , from another , so the absence of these on the cancer cells meant the infant 's immune system would not have recognised that they were foreign .
They examined the genes of the cancer cells in the infant and found a deletion mutation some dna missing in the region that controls expression of the major histocompatibility locus ( hla ) .
