Cells showing immunoreactivity to pancreatic polypeptide, glucagon and substance - P were not detected.是什么意思？

Cells showing immunoreactivity to pancreatic polypeptide, glucagon and substance - P were not detected.

胰高血糖素 、 胰多肽和P - 物质在消化道各段均未检出阳性细胞.

cells

n. <生>细胞( cell的名词复数 )，小牢房，（修道士或修女住的）小房间，电池；

例句
An increasing body of evidence suggests that all of us have cancer cells in our bodies at times during our lives.
越来越多的证据表明，我们所有人一生中体内时有癌细胞存在。

showing

n. （电影、电视节目等的）展映，放映，（在某事件中或某一期间的）表现，表演；v. 给…看( show的现在分词 )，表现出，显露出，上演；

例句
The fabric was showing signs of age...
这块衣料可以看出岁月留下的痕迹。

immunoreactivity

免疫反应性；

例句
Exercise also decreased striatal DA transporter and tyrosine hydroxylase immunoreactivity in MPTP - lesioned mice.
运动也可以减少纹状体多巴胺转运体,还能抑制酪氨酸羟化酶的免疫反应性.

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

pancreatic

--

例句
Objective: Ampulla being obstructed can cause cholestasis and pancreatic juice regurgitation.
目的: 胰胆管壶腹梗阻可引起胆汁淤积及胰液反流.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

substance

n. 物质，材料，实质，内容，[神]灵，（织品的）质地；

例句
This is how we see our tasks, and the substance and content of our work for the forthcoming period.
这就是我们对工作任务的看法，以及下一阶段我们工作的实质与内容。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

not

adv. 不，[用以表示否定、否认、拒绝、禁止等]不是，几乎不，未必，没有[用于否定后面的词或短语]；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

detected

vt. [无]对…检波；v. 发现，发觉，查明( detect的过去式和过去分词 )；

例句
The disease was detected during a routine check-up.
这个病是在做常规体检时查出来的。