目的基因导入受体细胞后，是否可以稳定维持和表达其遗传特性，只有通过鉴定和检测才能知道。下列属于目的基因检测和鉴定的是
①检测受体细胞是否有目的基因
②检测受体细胞是否有致病基因
③检测目的基因是否转录
④检测目的基因是否翻译成蛋白质

根据短文内容，回答问题。

Pisces (February 20 to March 20)

      It's the sign of the fish. Pisceans are very free-flowing（自由散漫的）people. They often feel bad when they cannot do the things that they want to. When things don't run well, they will often become very angry. A Piscean can usually make the best of a bad situation if they really want to. They can easily get along with other people and the outside world.

      Quality: Negative（阴性）          Ruler: Neptune （海王星）

      Triplicity: Mutable （变通型）     Quadruplicity: Water （水相）

      Pisces can be given cameras, socks and shoes as presents. Music of all kinds is welcome, such as CDs, piano and concert tickets. Anything that makes a Pisces think of water and seas is great, such as ships, going boating, a trip to the sea and a hot bath.

心脏瓣膜只能向一个方向开，保证血液按一定方向流动．下列血流方向正确的是（　　）