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1。When the normal tissue extracts of the twele indiidual specimens were subjected to double diffusion in agar gel against tl-abs and t2-abs, no precipitin band formation was obsered.
2。 it was found that each of the twele tumor extracts formed single bands against both antiserum preparations.
尤其是against在语境中什么意思不知道antiserum preparations也不知道怎么翻译

第二句中的against可能是“对照”的意思，而antiserum preparation 可能是“抗血清制剂或标本”